主谓一致练习题附答案高考语法复习

高考英语语法填空分类练习班级考号姓名总分一、主谓一致（一）填空1.(2022年新高考全国Ⅰ卷)The plan will extend protection to a significant number of areas that ___58___ (be)previously unprotected, bringing many of the existing protected areas for giant pandas under one authority to increase effectiveness and reduce inconsistencies in management.2.(2020新高考Ⅰ,41)Often, only a small part of a museum’s collection(be) on display. Most of it is stored away or used for research.3.(2020课标全国Ⅰ, 67)“This really excites scientists,” Carle Pieters, a scientist at Brown University, says, “because it(mean) we have the chance to obtain information about how the moon is constructed.”4.(2020课标全国Ⅱ, 62)This is why decorating with plants, fruits andflowers (carry) special significance.5.语法填空Are you facing a situation that 1. (look)impossible to fix?In 1969, the pollution 2. (be) terrible along the Cuyahoga River near Cleveland, Ohio. It 3. (be)unimaginable that it could ever be cleaned up. The river was so polluted that it actually caught fire and burned. Now, years later, this river 4. (be) one of the most outstanding examples of environmental cleanup.But the river wasn t changed in a few days or even a few months. It took years of work to reduce the industrial pollution and clean the water. Finally, that hard work 5. (pay)off and now the water in the river 6. (be) cleaner than ever.Maybe you 7. (face) an impossible situation at present. Maybe you have a habit that 8. (drive) your family crazy. Possibly you drink too much or don t know how to control your credit card use. When you face such an impossible situation, don t you want a quick fix and something to change immediately?While there 9. (be) amazing stories of instant transformation, for most of us, the changes 10. (be) gradual and require a lot of effort and work, like cleaning up a polluted river. Just be patient.6.(2021届山东日照一中高三11月份第二次调研,39)The difference is that most Chinese paper-cuts are red, while those in other countries (be) often made in many other colors.7.(2021届广东新高考适应性测试, 36)In fact, it (believe) that our athletic skills and language learning skills are located in the same area of the brain and indeed this is how children learn.8.(2021届山东烟台高三上学期期中,63)The Great Exhibition (hold) in 1851 as the first exhibition to showcase industrial design on an international scale(规模), contributing to American mass production.9.(2021届重庆预测性考试, 39)The novel revolves (围绕) around the basketball team, the West Bottom Badgers, and an incredible coach Rolabi, who (base) on Phil Jackson, the former coach of the Los Angeles Lakers.10.(2021辽宁沈阳铁路实验中学月考三,48)Chinese white dolphins, an endangered species that lives in the area, (be) a particular concern.11.(2021广东佛山一中期中,45)According to ancient traditional Chinese medicine, drinking a glass of warm water (be) beneficial to health.12.(2021山东青岛期中,65)The painting (display) for the first time back in 2005 to celebrate the museum s 80th anniversary.13.(2020河南洛阳期中,66)Shenzhen (be) a coastal city on the east bank of the Pearl River estuary, separated from Hong Kong by a natural river border.14.(2022届江苏省七市高考二模英语考前适应卷)NASA calls the instrument NACHOS, which ___59___(stand) for Nanosat Atmospheric Chemistry Hyperspectral Observation System. It contains imaging sensors designed to identify gases like sulfur dioxide(二氧化硫) and nitrogen dioxide(二氧化氮).（二）写作微练1.(2020课标全国Ⅰ)Although the farm was not big,(有各种各样的水果)on it.2.(2020新高考Ⅰ)The cross-country running race (很累人) but exciting and our school (打算举行) a similar one soon.二、情态动词和虚拟语气一、完成或翻译下面的句子,注意情态动词和虚拟语气的运用。

主谓一致练习题(含答案)经典一、主谓一致1．The number of the volunteers in our city 2 ,000. And sixty percent of them teachers and students.A．is; is B．is; are C．are; is D．are; are【答案】B【解析】句意：在我们城市志愿者的数量为2000.他们中的百分之六十是教师和学生。

根据句意，结合语法知识the number of,……的数目，做主语时谓语动词使用单数形式，而percent做主语时，谓语动词的单复数需要依据of后面的单词。

故答案为B.2．Be quiet, please. There a basketball game between our class and Class 8.A．has B．is going to be C．will have D．is going to have 【答案】B【解析】试题分析：句意：请安静，在我们班和8班之间将会有一场篮球比赛。

根据句意可知，这里使用的是there be句型，表示“有……”，故A、C和D都不对；there is going to be是there be句型的将来时态。

考点：考查there be句型。

3．_______ a big party in our school in two weeks.A．It is B．It will beC．There was D．There is going to be【答案】D【解析】【详解】句意：在我们学校两周之后将有一个大的聚会。

根据句意可知，译为“有”，用there be句型，排除A和B；且根据in two weeks可知，用一般将来时，故选D。

4．—I called you at 5:00 yesterday afternoon, but no one answered.—Sorry, I with my parents ________ at that time.A．was shopping B．were shoppingC．are shopping D．went shopping【答案】A【解析】试题分析：—我昨天下午五点给你打电话了，但是没人接。

主谓一致练习题(含答案)一、主谓一致1．Anna her XXX soft music.A．Both; and【答案】A【解析】句意：XXX和她弟弟都喜欢听轻音乐。

根据both---and---两者都---，连接句子两个主语时，谓语动词用复数；Neither----nor----既不---也不---，当连接句子的两个主语时，谓语动词就近原则；either---or---或者---或者---，当连接句子的两个主语时，谓语动词就近原则；Notonly--- but also---不仅---而且---，当连接句子的两个主语时，谓语动词就近原则；根据like故选A点睛：both---and---两者都---，连接句子的两个相同成分，例如：Both Lily and Lucy arestudents.；Neither----nor----既不---也不---，其含义是否定的，可连接任意两个并列的成分，当连接句子的两个主语时，谓语动词就近原则。

例如：XXX；either---or---或者---或者---，表示两者之一，两节句子的两个并列成分，，当连接句子的两个主语时，谓语动词就近原则。

例如：Either you or me am going there。

B．Neither; XXX; orD．Not only; but also2．students in the classroom twenty. The others are in the library.A．The number of; isB．A number of; areC．The number of; are【答案】A【解析】试题分析：句意：教室里的学生人数是二十，其他的人在图书馆。

The number of ……的数量，谓语动词用单数；a number of大量的，谓语动词用复数。

The others其他的，表示复数，谓语动词用复数，结合题意故选A。

英语主谓一致练习题20篇及解析一、主谓一致1．---I saw Tom's father bought lots of books yesterday.---That's not strange. Not only Tom but also his father _______reading.A．enjoy B．enjoys C．enjoyed【答案】B【解析】【详解】句意：——昨天我看见汤姆的爸爸买了许多书。

——那不奇怪，不仅汤姆而且他爸爸喜欢读书。

根据not only..but als o… 不仅……而且……，连接句子的两个主语时，谓语动词就近原则，根据句意说明一种情况，用一般现在时态，根据his father单三，所以谓语动词用单数形式；故选B2．（两者之中）每一方的;每一的She studied history and philosophy, but she had little interest in either subject. 她学过历史和哲学,但对这两门课都没有多少兴趣。

代词 pron.3．______ Lucy ______ you can go to the party. One of you has to stay at home to look after your grandma.A．Neither; nor B．Either; or C．Not only; but also D．Both; and【答案】B【解析】【详解】句意：或者露西或者你能去聚会。

你们中的一个人不得不待在家里照顾奶奶。

考查并列连词短语。

A. Neither; nor既不也不；B. Either; or或者，或者；C. Not only; but also不但，而且；D. Both; and两者都。

根据One of you has to stay at home to look after your grandma.可知，两者中的一个能去，故选B。

主谓一致练习题及答案主谓一致是英语语法中一个非常重要的概念，它指的是主语与谓语在人称和数上保持一致。

主谓一致错误是英语学习者常犯的错误之一。

为了帮助大家更好地掌握主谓一致，下面将提供一些练习题及答案。

练习题一：1. The dog (bark) loudly at the stranger.2. My brother (enjoy) playing basketball.3. The students (study) hard for the exam.4. She (has) a beautiful voice.5. The cat (sleep) peacefully on the couch.答案一：1. barks2. enjoys3. study4. has5. sleeps练习题二：1. The flowers (bloom) in spring.2. The baby (cry) loudly in the middle of the night.3. The birds (sing) sweetly in the morning.4. The children (play) happily in the park.5. The car (run) fast on the highway.答案二：1. bloom2. cries3. sing4. play5. runs练习题三：1. The book (belong) to me.2. The students (listen) attentively to the teacher.3. The trees (sway) in the wind.4. The computer (crash) suddenly.5. The birds (migrate) in the winter.答案三：1. belongs2. listen3. sway4. crashes5. migrate练习题四：1. The baby (laugh) happily.2. The sun (shine) brightly in the sky.3. The students (write) their essays.4. The water (boil) in the pot.5. The flowers (smell) fragrant.答案四：1. laughs2. shines3. write4. boils5. smell练习题五：1. The birds (build) a nest in the tree.2. The teacher (explain) the lesson to the students.3. The cat (purr) when it is happy.4. The car (break) down on the road.5. The children (jump) happily on the trampoline.答案五：1. build2. explains3. purrs4. breaks5. jump通过以上的练习题，希望大家能够更好地理解和掌握主谓一致的规则。

一、专题引入（4 mins）在正式上课之前，我们先来句子纠错，看看你是否细心，是否还记得我们之前学过的知识。

1. Both boys has their own hobbies.2. The class is busy writing English passages.3. Neither you nor I are wrong.每个句子都有一个错误，错误点在于句子谓语动词的使用上，你能找出来吗？(校对答案：1. has- have 2. is – are 3. are – am 并请同学说明原因，考查这位同学是否掌握到位) 二、专题知识梳理（20 mins）知识点1：主谓一致三大考点知识点2：语法一致主语单复数决定谓语动词的单复数形式，即主语是单数，谓语用单数，主语是复数，谓语用复数。

例句：Tow students are waiting for you in your office. 两名学生在办公室等你。

Both girl are interested in listening to music. 两个女孩都对听音乐感兴趣。

1-5 A A B D D6-10 C C A C A【分析】同学需要特别注意的是语法一致，意义一致和就近原则知识点表格上的内容，需要熟记并运用。

五、学法提炼（2 mins）1、专题特点：主谓一致专题的知识点理解较易，但难点在于熟记表格中的每种情况，并能够熟练运用到做题当中去。

2、解题方法：分类熟记知识点表格。

3、分析事项：在考试中，主谓一致中的三个考点是混合出现的，同学必须熟练掌握三个考点各自的内容，以及熟记。

建议课后对知识点条目进行背诵。

一、专题引入（1 mins）上面我们复习了非谓语动词中语法一致的内容，接下来我们继续复习意义一致和就近原则的知识。

二、专题知识梳理（15 mins）知识点1：意义一致情况例句1. 有些集体名词既可以表示单数，又可以表示复数，这类集体名词作主语时，如果它们所表示的人或物是作为一个整体来理解，谓语动词用单数形式；如果作为若干个体来理解，则谓语动词用复数形式这些词有：family, class, crowd, team, group等【注意】people，police等名词一般做复数用1. Class 4 is on the third floor.2. Class 4 are studying in the classroom.3. The police are looking for the lost child.2. 主语是书名，片名，格言，剧名，报名，国名等的复数形式，谓语动词一般ongoing单数形式1. Gone with the wind is an interesting book.3. 表示“时间，重量，长度，价格”等的名词的复数做主语时，谓语动词用单数形式1. Thirty minutes is enough for the work.4. 一些学科名词以-ics 结尾，如：mathematics，politics，physics等，都属于形式上是复数名词，实际意义为单数名词，它们做主语时，谓语动词用单数形式1. Some teachers says that physics is difficult for students to study.5. “the+形容词”表类别、一类人或物，当它表示一类人 1. The rich are not always happy.1-5 A C D B D6-10 C C A C A【分析】同学需要特别注意的是语法一致，意义一致和就近原则知识点表格上的内容，需要熟记并运用。

英语主谓一致真题汇编（含答案）及解析英语主谓一致真题汇编(含答案)及解析一、主谓一致1．---I saw Tom's father bought lots of books yesterday.---That's not strange. Not only Tom but also his father _______reading.A．enjoy B．enjoys C．enjoyed【答案】B【解析】【详解】句意：——昨天我看见汤姆的爸爸买了许多书。

——那不奇怪，不仅汤姆而且他爸爸喜欢读书。

根据not only..but also… 不仅……而且……，连接句子的两个主语时，谓语动词就近原则，根据句意说明一种情况，用一般现在时态，根据his father单三，所以谓语动词用单数形式；故选B2．Alice, together with her classmates punished for breaking the school rules last week. A．is B．are C．was D．were 【答案】C【解析】【详解】句意：艾丽斯和她的同学上周因违反校规而受到惩罚。

考查一般过去时和主谓一致。

根据last week可知句子时态应用一般过去时，排除A、B选项；together with her classmates在句中作状语，主语是Alice，第三人称单数，所以谓语动词也要用第三人称单数形式，排除D选项；故答案选C。

3．Everyone except Tom and Jim _______ going to visit some friends in Shenzhen.A．is B．are C．am D．be【答案】A【解析】【详解】句意：除了汤姆和吉姆之外，每个人都会去拜访在深圳的一些朋友。

Except意为“除了”，引起的结构跟在主语后面，不能看作是并列主语，主语如是单数，其谓语动词仍然用单数形式，本句主语是everyone，不定代词，谓语动词用be动词单数is，故选A。

（完整版）高考英语专题复习主谓一致（附答案）.doc高考英语专题复习主谓一致（附答案）I.考点分析一、概述主谓一致是指句子成分之间或词语之间在人称、性、数等方面的一致关系。

处理主谓一致一般应遵循以下三条原则：1.语法一致，即在语法形式上取得一致。

例如，主语为单数形式，谓语动词也为单数形式；主语为复数形式，谓语动词也采取复数形式。

a. The number of errors was surprising.b. Julia and her twin sister naturally look a lot alike.2.意义一致，即从意义着眼处理一致关系。

a. The crowd were fighting for their lives. (单形名词主语要求复数谓语动词，下划线部分表示一个整体中的成员 )b. Five minutes is enough. ( 复数名词单数谓语动词，下划线部分表示一个数目)3.邻近原则，即指谓语动词的形式与邻近的名词一致。

a. A man of abilities are needed（.动词 are 不与主语 a man一致，而与其邻近的复形名词a bilities 形式上一致。

二、主谓一致注意要点：1.当名词词组中心词为表示度量、时间等复数名词时，往往可根据意义一致的原则，把这些复数名词看作一个整体，谓语动词采取单数形式。

a. The dollars is not enough.b. Three months passes in no time at all on the ranch.如果明显地指一个个个体，则要根据语法一致地原则，谓语动词用复数形式。

a. There are two sliver dollars in each of the stockings.2.如果名词词组中心词是all, most, half, the last, the rest, the remainder等词组时，其主谓关系一般遵循意义一致的原则：如所指为复数意义，谓语动词用复数形式；如所指为单数意义，则谓语动词用单数形式。

主谓一致练习题附答案高考语法复习1. We e ach ____strong points and each of us on the other hand ____weak p oints.A. have , haveB. has, haveC. has , hasD. have, has2. A library with five thousand books ______ to the nation as a gift.A. is offeredB. has offeredC. are offeredD. have offered3. The police _______ determined to bring back the missing boy when his family ______ almost given up all hope.A. is, hasB. are , haveC. are , hasD. is, have4. In this institution a medal together with a prize of certain sum of money_____ gains success in science and technology every two years.A. are given to anyoneB. is given to whoeverC. are given to whoD. is given to whom5. You should try Larry and kevin's restaurant because ___the best in the city.A. theirs isB. their's isC. they areD. their's are6. Only one of the students who __ present__ to speak at the meeting .A. is, isB. are, areC. are , isD. is, are7. -- ___ the dollars a big sum of money to him ? -- I suppose ___.A. Are, toB. Were, toC. Will be, toD. Is , so8. When and where to build the new factory _____ yet.A. is not decidedB. are not decidedC. had not decidedD. have not decided9. Either Tom or Jane did ________ homework in the classroom .A. theirB. theirsC. hisD. her10. Reading magazines and novels ________ helpful.A. isB. areC. haveD. has11. In spring, many plants bloom, which ____ the world even more beautiful.A. madeB. makeC. makesD. have made12. It's not you but Mr. Anderson who ___ to answer ___ the incident.A. are, forB. were, toC. is, forD. was , back13. There are two books on the bookshelf. ____ of them ____ worth ____.A. Both , are, being readB. All, are , readingC. Neither, is, being readD. Either, is , reading14. The number of people invited ______ fifty, but a number of them ______absent for different reasons. ( MENT 96 )A. were , wasB. was, wasC. was, wereD. were , were15. I don't think the poor _________ poor.A. are alwaysB. has been alwaysC. is alwaysD. always are16. Every means _______ tried but without much result.A. have beenB. hadC. hasD. has been17. At the meeting each man and each woman _______ praised by the manager yesterday. A. was B. were C. would be D. had been18. One and a half days ___ what I need. A. was B. is C. are D. were19. Sixty percent of the work______ .A. have been doneB. had been doneC. has been doneD. has done20. ______ neither you nor your brother interested in swimming ?A. AreB. IsC. DoD. Does21. Such films _____ shown yesterday ______ not worth seeing again.A. that was, isB. as were, areC. as were, isD. those were , are22. Three fourths of the earth's surface ______ covered with water.A. isB. areC. wasD. were23. About 85 percent of the students ____ good , and part of them _____interested in biology. A. is, are B. are, are C. are , is D. is , is24. Politics ______ now taught in all schools. A. is B. are C. be D. being25. Do you know what his politics ____ ? A. is B. are C. be D. being26. The wounded __________ sent to the hospital at once .A. wereB. areC. isD. was27. The Chinese _____ hard-working. A. be B. being C. is D. are28. The United Nations ______ in 1945.A. are foundB. is foundC. was foundedD. were founded29. Our headmaster and secretary ___ kind and strict.A. isB. beC. areD. were30. More than one girl ____ late for class this morning.A. areB. isC. wasD. were31. Many a student ____ in the exam.A. have failedB. had been failedC. has failedD. will be failed32. A pair of broken glasses ____ on the desk.A. is layingB. is lyingC. are lyingD. are laying33. What ____the police looking for? A. is B. are C. will D. did34. No boy and no girl ______ waiting for the bus.A. areB. beC. wereD. is35. There ______ I'd like to answer this evening.A. are one or two lettersB. has one or two lettersC. is one or two lettersD. have one or two letters36. Great quantities of fish ______ in the river in the past few days.A. is caughtB. are caughtC. has been caughtD. have been caught37. Why she didn't come here ______ quite clear.A. are notB. will notC. isn'tD. were not38. What he says and what he does ___________ .A. is not agreeB. are not agreeC. does not agreeD. do not agree39. Not only politics but also English is important. In other word, ______ is important.A. English , as well as politicsB. politics as well as EnglishC. both politics and EnglishD. politics as well as the English40. This is the one of the books on the subject that ______ ever been writtenin Chinese. A. have B. has C. had D. are41. The exam he paid no attention to _ him the chance to go to college.A. being costedB. costingC. costD. costs42. Not only the students but also the teacher ______ about the matter.A. are talkingB. is to talkC. have talkedD. are having talked43. On the ceiling of our classroom ______ four lights.A. hangB. are hangedC. hangedD. hangs44. The world's supplies of oil _____ gradually ______ up with the development of industry and the increase of cars.A. is ; usedB. are being; usedC. has; usedD. have been; using45. He is one of the students who , I am sure, always do _____ best.A. hisB. one'sC. myD. their46. The population of China ____ over 12 million and eighty percent of thepopulation _____ peasants. A. is; are B. are; is C. is ; is D. are ; are47. He said that the twelfth and last lesson _______ rather difficult .A. wereB. wasC. will beD. are48. His “Selected Poems” ______ first published in 1965.A. wereB. wasC. has beenD. were49. All but one ______ here just now. A. is B. was C. has been D. were50. Seventy percent of the students here ______ from the country side.A. isB. areC. comesD. has come51. More than 60 percent of world’s radio programmes ___ in English.A. isB. wasC. areD. be52. The whole class ______ the teacher attentively.A. are listening toB. is listening toC. are listeningD. is listening53. The United States of America ______ one of the most developed countriesin the world. A. is B. are C. was D. were54 The air in big cities ______ very dirty by factories.A. are often madeB. is often madeC. have often madeD. has often made55. A large number of students of this school ______ fond of playing football.A. areB. wasC. isD. be56. Mary as well as her sisters ______ Chinese in China.A. are studyingB. have studiedC. studiesD. study57. I, who ______ your teacher, will try my best to help you with your lessons.A. beB. amC. areD. is58. Ten dollars ______a big sum for a small child , and they will go a longway . A. are B. being C. have D. is59. The rich ______ not always happy. A. are B. is C. has D. have60. Apples of this kind _______.A. tastes goodB. tastes wellC. taste goodD. taste well61. The Olympic Games _______ held every _______ years.A. is...four B. are...four C. is...five D. are (iv)62. No one but her parents ______ it.A. knowB. knowsC. is knowingD. are knowing63. ______ a good enough price for this book.A. Two yuans areB. Two yuan areC. Two yuans isD. Two yuan is64. No bird and no beast _______ in the lonely island.A. are seenB. is seenC. seeD. sees65. The news of victories ______ spreading far and wide.A. isB. areC. have beenD. were66.Few of his family ______ with his imaginative ideas.A. agreeB. agreesC. are agreedD. is agreed67. The paper for books and newspapers _____ made of wood.A. areB. isC. hasD. have68. Neither your mother nor you ______ at home. A. am B. is C. are D. be69. It is she who _______ wrong. A. is B. am C. are D. has been70. ________ well looked after in that hospital.A. Wounded areB. Wounded isC. The wounded areD. The wounded is71. Twenty of us are old. The rest ___ young. A. is B. are C. was D. were72. The Smiths ___to move into the new building.A. are B. is C. has D. will73. It is said the police ______ trying their best to catch the murderer.A. haveB. hasC. isD. are74. Here ______ a new pair of shoes for you. A. is B. are c. have D. has75. The best ______ still unknown. A. is B. are C. be D. were76. We each _______ to pass the entrance examinations.A. hopesB. hopeC. hopingD. is hoping77. Bread and butter ______ a kind of food. A. is B. are C. am D. be78. The watch and chain ______ of gold.A. is madeB. are madeC. were madeD. am made79. Half the eggs ______ bad. A. is B. are C. am D. be80. ______ this pair of glasses ______ her well?A. Is...fit B. Do...fit C. Does...fit D. Are (i)81. About eighty percent of the students in his class ___ below sixteen.A. isB. areC. amD. be82. There ______ a map of the world and some pictures on the wall.A. isB. areC. amD. be83. A large quantity of water pipes ___ needed. A. are B. is C. has D. have84. Large quantities of paper ___wasted. A. are B. is C. has D. have85. How a nd why he ____come t o Princeton, New J ersey ____ a story of struggle,success and sadness. A. had…was B. had…are C. had…has d. had…have 86. Not only I but also Jessie and Mary _____ tired of having one examinationafter another. A. is B. are C. am D. be87.My driving licence , rather than my credit cards, ______lost .A. haveB. areC. isD. has88. Nobody but Jane and Mary ___secret.A. knowB. knowsC. have knownD. is known89. A great deal of ______ was done to crops.A. damagesB. damagingC. damageD. ruin90. —Do you want the pants? —My pants ____ laid in bed.A. isB. wasC. areD. being91. I told him what I was surprised ____ his attitude towards his study.A. isB. wasC. at isD. at was92. I have finished a large part of the book; the rest ___ more difficult.A. isB. areC. wasD. were93. They each ______ a new dictionary. A. has B. have C. is D. are94.The pilot as well as four of the passengers ______death .A. has escapedB. have escapedC. has been escapedD. have been escaped95. Every hour and every minute __ important. A. are B. were C. is D. will96. Nobody except Bill and Johnny ______entered the second round of theinterview. A. have B. has C. have been D. has been97. He is one of the old scientists who ______nothing about his personal income and fame . A. cares B. care C. is caring D. are caring98. When and where to go for the on-salary holiday ________yet.A. are not decidedB. have not been decidedC. is not being decidedD. has not been decided99.Mary is one of the girls who _____by the headmaster at the meeting.A. is praisedB. are praisedC. was praisedD. were praised100.Mary is the only one of the girls who ____by the headmaster at the meeting.A. is praisedB. are praisedC. was praisedD. were praised主谓一致练习题附答案高考语法复习Keys: 01—10 DABBA CDADA 11—20 CCDCA DABCA 21—30 BABAB ADCAC 31—40 CBBDA DCDAB 41—50 CBABD ABBDB 51—60 CAACA CBDAC 61—70 BBDBA ACCAC 71—80 BADAA BAABC 81—90 BAAAA BCBCC 91—100 DABCC BBDDC。