下载文档原格式
（英语）初中英语连词解题技巧及练习题一、初中英语连词1．There are many trees on _________________ side of the road. They were planted several years ago.A. anyB. bothC. eitherD. every【答案】 C【解析】【分析】句意：有许多树在马路两旁，它们是几年前种植的。
on both sides=on either side，固定搭配，在两旁，故选C。
【点评】考查代词辨析，注意on both sides=on either side的用法。
2．——What do you think of our school basketball team?——They're going to lose the match __________ they improve their skills.A. unlessB. untilC. ifD. as【答案】 A3．—Tom, what does "Stay hungry, stay foolish." mean?—You can have your own understanding. But I think it means follow your original aspiration （初心） you will succeed.A. soB. butC. andD. or【答案】 C4．How can we improve our environment a lot each of us does something useful for it?A. whileB. untilC. afterD. unless【答案】 D5．_____________ my brother arrived in Thailand, he visited the local biggest temple at once.A. As soon asB. WhileC. UntilD. Before【答案】 A6．She got up very early that day __________ she could catch the first train.A. becauseB. ifC. thoughD. so that【答案】 D7．She got up late, __________ she missed the bus.A. soB. becauseC. thoughD. but【答案】 A8．_________ we didn't win the basketball game, we were satisfied with our hard work. A. If B. Though C. Since D. Because【答案】 B【解析】【分析】句意：虽然我们没有赢得篮球赛，但我们对我们的努力感到满意。
（英语）中考英语初中英语连词解题技巧(超强)及练习题(含答案)一、初中英语连词1．Could you tell me __________the singer will come to our school or not?A. ifB. whetherC. thatD. what【答案】 B【解析】【分析】句意：你能告诉我歌手是否会来我们学校吗？whether...or not，固定搭配，是否，故选B。
【点评】考查固定搭配，注意whether...or not的用法。
2．They waited ____ it was dark before leaving, ____ they didn't want anyone to see them leave.A. since; becauseB. until; asC. unless; butD. so; because【答案】 B3．—The air pollution is terrible.—It will be worse ______ we take action to protect the environment.A. ifB. unlessC. untilD. when【答案】 B4．My wallet dropped on the ground ________________ I was walking.A. beforeB. afterC. whileD. because【答案】 C5．She got up late, __________ she missed the bus.A. soB. becauseC. thoughD. but【答案】 A6．___________three fourths of the Earth's surface is covered with water, 97 percent of it is salt water in the sea.A. ButB. AlthoughC. AsD. However【答案】 B7．Little Kate went to school___________ it rained heavily yesterday.A. thoughB. ifC. butD. since【答案】 A8．Some people waste food___________ others haven't enough.A. whileB. duringC. whenD. which【答案】 A9．Emily, you are playing video games again! Study hard, ______ you will fail in the coming exam.A. thenB. soC. andD. or【答案】 D【解析】【分析】句意：Emily，你又玩游戏！努力学习，否则你将在接下来的考试中失败。
初中英语连词解题技巧(超强)及练习题(含答案)含解析一、初中英语连词1．Mr. Smith is very rich, ________ he doesn't feel happy.A. andB. orC. butD. so【答案】 C【解析】【分析】句意：史密斯先生非常有钱，但是他感觉不开心。
very rich非常有钱和后面的doesn't feel happy，感觉不开心是转折关系，but但是，表转折，故选C。
【点评】考查连词，根据句意来选择合适的连词。
2．It won't be a long time ________ your son comes back. Don't be worried.A. sinceB. asC. beforeD. unless【答案】 C3．I think you should be against the situation, ________, of course, you are happy with it.A. becauseB. howeverC. anywayD. unless【答案】 D4．Giveme your email address, _______I'll send you the form.A. orB. andC. butD. nor【答案】 B5．The film is really exciting. the students their teacher is enjoying the film.A. Both; andB. Not only; but alsoC. Either; orD. Neither; nor【答案】 B6．I don't like western food. I seldom eat it ______________ to McDonald's with my daughter. A. if B. when C. as D. unless【答案】 D7．__________ the teacher came in, the students stopped reading at once.A. WhenB. WhileC. BeforeD. /【答案】 A8．You can take___________ the train___________ the bus there. It will take the same amountof time.A. eithers orB. both andC. neither; norD. not only: but also【答案】 A9．Emily, you are playing video games again! Study hard, ______ you will fail in the coming exam.A. thenB. soC. andD. or【答案】 D【解析】【分析】句意：Emily，你又玩游戏！努力学习，否则你将在接下来的考试中失败。
初中英语连词解题技巧和训练方法及练习题(含答案)含解析一、初中英语连词1．My boss is waiting for the report, so I can't leave here _______________ I finish it.A. sinceB. untilC. though【答案】 B【解析】【分析】句意：我的老板正等着汇报，因此我直到完成汇报才能离开这儿。
A.自从；B.直到；C.尽管。
not…until，直到……才，故选B。
【点评】考查连词辨析，注意知己固定搭配not…until的用法。
2．I think you should be against the situation, ________, of course, you are happy with it.A. becauseB. howeverC. anywayD. unless【答案】 D3．It was the middle of the night _____the sound of the piano woke me up.A. becauseB. ifC. whenD. although【答案】 C4．He is getting fat, _______________ he has decided to go to work on foot.A. becauseB. thoughC. soD. and【答案】 C5．She got up very early that day __________ she could catch the first train.A. becauseB. ifC. thoughD. so that【答案】 D6．Jim has been in the factory for two months ________ he left school.A. whenB. sinceC. as soon asD. whether【答案】 B7．Yesterday morning I was just leaving the telephone rang.A. whenB. whileC. becauseD. since【答案】 A8．After the new high-speed railway line began operations, the time on the trip from Lianyungang to Qingdao now is much less than __________in the past.A. oneB. thisC. thatD. it【答案】 C【解析】【分析】句意：新高速铁路开通后，连云港到青岛的时间比过去少了很多。
【英语】英语连词及其解题技巧及练习题(含答案)含解析一、初中英语连词1．Tony has learned a lot about Chinese culture ______________ he came to China.A. beforeB. sinceC. untilD. when【答案】 B【解析】【分析】句意：自从来到中国托尼学到很多关于中国文化的东西。
before在……之前；和过去完成时连用；since自从，后跟表示过去的时间状语和现在完成时连用；until直到……才……；不和完成时连用，when当……时候；和过去完成时连用。
故选B。
【点评】连词辨析。
掌握每个连词的使用规则。
2．It won't be a long time ________ your son comes back. Don't be worried.A. sinceB. asC. beforeD. unless【答案】 C3．—In shopping centers of most foreign countries, we can see many products made in China. —What we need is ________ "Made in China", ________ "Created in China". There is still a long way to go.A. both…andB. not only…but alsoC. neither…norD. either…or【答案】 B4．——What do you think of our school basketball team?——They're going to lose the match __________ they improve their skills.A. unlessB. untilC. ifD. as【答案】 A5．The film is really exciting. the students their teacher is enjoying the film.A. Both; andB. Not only; but alsoC. Either; orD. Neither; nor【答案】 B6．Some people won't realize the importance of their health ____ they lose it.A. becauseB. afterC. whenD. until【答案】 D7．—The air pollution is terrible.—It will be worse ______ we take action to protect the environment.A. ifB. unlessC. untilD. when【答案】 B8．—Learning to love is like learning to walk.—Yes, ______ we step out bravely, we'll find it's not so difficult.A. as a resultB. even thoughC. as long asD. as far as【答案】 C9．My father was preparing for his speech ______________ my mother was doing some washing last night.A. ifB. unlessC. whileD. until【答案】 C10．Peter bought some goldfish ______________ he found it difficult to raise them.A. becauseB. orC. thoughD. until【答案】 C11．I don't like western food. I seldom eat it ______________ to McDonald's with my daughter.A. ifB. whenC. asD. unless【答案】 D12．The film is really exciting. ______the students ______ their teacher is enjoying the film. A. Both; and B. Not only; but also C. Either; or D. Neither; nor【答案】 B13．___________three fourths of the Earth's surface is covered with water, 97 percent of it is salt water in the sea.A. ButB. AlthoughC. AsD. However【答案】 B14．Tom won't play computer games __________ he finishes his homework.A. ifB. so thatC. unlessD. although【答案】 C15．After the new high-speed railway line began operations, the time on the trip from Lianyungang to Qingdao now is much less than __________in the past.A. oneB. thisC. thatD. it【答案】 C【解析】【分析】句意：新高速铁路开通后，连云港到青岛的时间比过去少了很多。
（英语）英语连词解题技巧及练习题(含答案)一、初中英语连词1．Tim is crazy about DIY. He continues doing it _____he meets up with difficulties.A. thoughB. soC. butD. or【答案】 A【解析】【分析】句意：蒂姆酷爱自己动手，尽管遇到了困难，他还是继续做这件事。
A尽管，B所以，C但是，D或者，根据遇到了困难还是继续做这件事，可知是让步状语从句连词though，故选A。
【点评】考查连词，注意though的用法。
2．___________ you know the answer, please ___________ your hand.A. If; raiseB. If; riseC. Unless; raiseD. Unless; rise【答案】 A3．—Tom, what does "Stay hungry, stay foolish." mean?—You can have your own understanding. But I think it means follow your original aspiration （初心） you will succeed.A. soB. butC. andD. or【答案】 C4．They waited ____ it was dark before leaving, ____ they didn't want anyone to see them leave.A. since; becauseB. until; asC. unless; butD. so; because【答案】 B5．You will find it useful to learn to study by yourself _____ you go to college.A. whileB. untilC. SinceD. when【答案】 D6．—Mom, I want to be an engineer when I grow up.—Son, your dream will not come true _____ you keep trying your best.A. whenB. whetherC. unlessD. because【答案】 C7．How can we improve our environment a lot each of us does something useful for it?A. whileB. untilC. afterD. unless【答案】 D8．_____________ my brother arrived in Thailand, he visited the local biggest temple at once. A. As soon as B. While C. Until D. Before【答案】 A9．Study hard, _______ our parents will be disappointed.A. andB. butC. orD. because【答案】 C10．__________ the teacher came in, the students stopped reading at once.A. WhenB. WhileC. BeforeD. /【答案】 A11．Little Kate went to school___________ it rained heavily yesterday.A. thoughB. ifC. butD. since【答案】 A12．My mother doesn't like stories _____have sad endings.A. thatB. whoC. whereD. those 【答案】 A【解析】【分析】句意：我妈妈不喜欢有悲伤的结局的故事。
（英语）初中英语连词解题技巧(超强)及练习题(含答案)及解析一、初中英语连词1．A recent survey shows that 44 percent of Americans want to use self-driving cars, _________34 percent believe that they will make the roads mote dangerous.A. althoughB. becauseC. if【答案】 A【解析】【分析】句意：一个近来的调查显示44%的美国人想要使用无人驾驶车，尽管34%的人相信它们会让道路更加危险。
A. 尽管；B. 因为；C. 如果，根据两句的关系可知是让步状语从句，although：尽管，故选A。
【点评】考查连词辨析，根据语境确定两句的关系，选出合适的连词。
2．—Why do many kids spend more time playing computer games?—Because their parents are _____ busy _____ they have little time to stay with their children. A. too, to B. so, that C. such, that D. enough, to【答案】 B3．It won't be a long time ________ your son comes back. Don't be worried.A. sinceB. asC. beforeD. unless【答案】 C4．—Tom, what does "Stay hungry, stay foolish." mean?—You can have your own understanding. But I think it means follow your original aspiration （初心） you will succeed.A. soB. butC. andD. or【答案】 C5．—My parents are crazy about Running Man. How about your parents?—_________ my dad _________ my mum likes it. Instead, they prefer The Voice of China.A. Neither; norB. Both; andC. Not only; but also【答案】 A6．Giveme your email address, _______I'll send you the form.A. orB. andC. butD. nor【答案】 B7．He knows a lot, ________ he is just a child.A. howeverB. thoughC. andD. because【答案】 B8．You will find it useful to learn to study by yourself _____ you go to college.A. whileB. untilC. SinceD. when【答案】 D9．—Mom, I want to be an engineer when I grow up.—Son, your dream will not come true _____ you keep trying your best.A. whenB. whetherC. unlessD. because【答案】 C10．—The air pollution is terrible.—It will be worse ______ we take action to protect the environment.A. ifB. unlessC. untilD. when【答案】 B11．—Could you tell me more about the movie Frozen II __________ you have watched it. —No problem. But you'd better watch it in person __________ I can't express its beauty.A. since; soB. unless; asC. since; as【答案】 C12．—Learning to love is like learning to walk.—Yes, ______ we step out bravely, we'll find it's not so difficult.A. as a resultB. even thoughC. as long asD. as far as【答案】 C13．The situation is becoming more serious ________________ we do something to save the Earth.A. ifB. whenC. becauseD. unless【答案】 D14．It is hard to review the knowledge we learn in class ___________ we take notes.A. ifB. unlessC. whenD. after【答案】 B15．Little Kate went to school___________ it rained heavily yesterday.A. thoughB. ifC. butD. since【答案】 A16．He doesn't feel ___________, ___________ he has to see a doctor.A. good enough: butB. well enough; butC. good enough; soD. well enough; so【答案】 D【解析】【分析】句意：他觉得不舒服，所以他必须去看医生。
（英语）初中英语连词常见题型及答题技巧及练习题(含答案)含解析一、初中英语连词1．Tim is crazy about DIY. He continues doing it _____he meets up with difficulties.A. thoughB. soC. butD. or【答案】 A【解析】【分析】句意：蒂姆酷爱自己动手，尽管遇到了困难，他还是继续做这件事。
A尽管，B所以，C但是，D或者，根据遇到了困难还是继续做这件事，可知是让步状语从句连词though，故选A。
【点评】考查连词，注意though的用法。
2．—Tom, what does "Stay hungry, stay foolish." mean?—You can have your own understanding. But I think it means follow your original aspiration （初心） you will succeed.A. soB. butC. andD. or【答案】 C3．—My parents are crazy about Running Man. How about your parents?—_________ my dad _________ my mum likes it. Instead, they prefer The Voice of China.A. Neither; norB. Both; andC. Not only; but also【答案】 A4．Giveme your email address, _______I'll send you the form.A. orB. andC. butD. nor【答案】 B5．It was the middle of the night _____the sound of the piano woke me up.A. becauseB. ifC. whenD. although【答案】 C6．_____________ my brother arrived in Thailand, he visited the local biggest temple at once.A. As soon asB. WhileC. UntilD. Before【答案】 A7．British people and Australian people speak the same language, ______________ they have different customs and cultures.A. andB. butC. soD. for【答案】 B8．Tom's father was cleaning the car _______________ his mother was doing housework.A. althoughB. asC. sinceD. while【答案】 D9．He is getting fat, _______________ he has decided to go to work on foot.A. becauseB. thoughC. soD. and【答案】 C10．Jim has been in the factory for two months ________ he left school.A. whenB. sinceC. as soon asD. whether【答案】 B11．___________three fourths of the Earth's surface is covered with water, 97 percent of it is salt water in the sea.A. ButB. AlthoughC. AsD. However【答案】 B12．My mother doesn't like stories _____have sad endings.A. thatB. whoC. whereD. those【答案】 A【解析】【分析】句意：我妈妈不喜欢有悲伤的结局的故事。
（英语）英语连词解题技巧及练习题及解析一、初中英语连词1．My boss is waiting for the report, so I can't leave here _______________ I finish it.A. sinceB. untilC. though【答案】 B【解析】【分析】句意：我的老板正等着汇报，因此我直到完成汇报才能离开这儿。
A.自从；B.直到；C.尽管。
not…until，直到……才，故选B。
【点评】考查连词辨析，注意知己固定搭配not…until的用法。
2．—In shopping centers of most foreign countries, we can see many products made in China. —What we need is ________ "Made in China", ________ "Created in China". There is still a long way to go.A. both…andB. not only…but alsoC. neither…norD. either…or【答案】 B3．This is the most important task should be finished soon.A. whichB. whatC. thatD. /【答案】 C4．—My parents are crazy about Running Man. How about your parents?—_________ my dad _________ my mum likes it. Instead, they prefer The Voice of China.A. Neither; norB. Both; andC. Not only; but also【答案】 A5．Giveme your email address, _______I'll send you the form.A. orB. andC. butD. nor【答案】 B6．The film is really exciting. ______the students ______ their teacher is enjoying the film.A. Both; andB. Not only; but alsoC. Either; orD. Neither; nor【答案】 B7．She got up late, __________ she missed the bus.A. soB. becauseC. thoughD. but【答案】 A8．You can take___________ the train___________ the bus there. It will take the same amount of time.A. eithers orB. both andC. neither; norD. not only: but also【答案】 A9．Some people waste food___________ others haven't enough.A. whileB. duringC. whenD. which【答案】 A10．Love your parents __________ they are alive. Don't wait until it is too late.A. whileB. thoughC. becauseD. unless【答案】 A【解析】【分析】句意：当你父母活着时爱他们。
初中英语连词常见题型及答题技巧及练习题(含答案)一、初中英语连词1．—Which sport do you prefer，volleyball basketball?—I prefer volleyball.A. orB. andC. but【答案】 A【解析】【分析】句意：——你更喜欢哪个运动，排球还是篮球？——我更喜欢排球。
A.或者，表示选择；B.和，表示并列；C.但是，表示转折。
根据答语可知选择了排球和篮球中的一个，所以用or，故选A。
【点评】考查连词辨析，注意平时识记其词义，理解句意。
2．Giveme your email address, _______I'll send you the form.A. orB. andC. butD. nor【答案】 B3．They waited ____ it was dark before leaving, ____ they didn't want anyone to see them leave.A. since; becauseB. until; asC. unless; butD. so; because【答案】 B4．The situation is becoming more serious ________________ we do something to save the Earth.A. ifB. whenC. becauseD. unless【答案】 D5．Jim has been in the factory for two months ________ he left school.A. whenB. sinceC. as soon asD. whether【答案】 B6．A recent survey shows that 44 percent of Americans want to use self-driving cars, _________34 percent believe that they will make the roads mote dangerous.A. althoughB. becauseC. if【答案】 A【解析】【分析】句意：一个近来的调查显示44%的美国人想要使用无人驾驶车，尽管34%的人相信它们会让道路更加危险。
初中英语连词解题技巧及练习题一、初中英语连词1．—We have red and yellow T-shirt, which color do you like?—I'm afraid . I think blue will be OK.A. bothB. eitherC. neitherD. none【答案】 C【解析】【分析】句意：——我们有红色和黄色的T恤，你喜欢哪种颜色？——恐怕两件都不喜欢。
我认为这件蓝色的不错。
A 两者都；B 两者中的任何一个，要么……要么……；C 两者都不；D 三个或三个以上的都不。
根据句意，可知我选的是蓝色的，红色和黄色的都没有选，故两者都不喜欢，故选C。
【点评】考查连词辨析。
注意识记各连词含义及用法。
2．Some people won't realize the importance of their health ____ they lose it.A. becauseB. afterC. whenD. until【答案】 D3．The situation is becoming more serious ________________ we do something to save the Earth.A. ifB. whenC. becauseD. unless【答案】 D4．Study hard, _______ our parents will be disappointed.A. andB. butC. orD. because【答案】 C5．Little Kate went to school___________ it rained heavily yesterday.A. thoughB. ifC. butD. since【答案】 A6．My mother doesn't like stories _____have sad endings.A. thatB. whoC. whereD. those【答案】 A【解析】【分析】句意：我妈妈不喜欢有悲伤的结局的故事。
that 引导定语从句，指物；who指人；where指地点，在从句中作地点状语，those那些，不引导定语从句，这是含有定语从句的主从复合句，先行词是stories，指物，在从句中作主语，关系代词用that/which，故选A。
【点评】此题考查定语从句。
注意定语从句的关系词的使用。
7．Love your parents __________ they are alive. Don't wait until it is too late.A. whileB. thoughC. becauseD. unless【答案】 A【解析】【分析】句意：当你父母活着时爱他们。
不要等到太迟才行动。
while当……时候；though虽然；because因为；unless除非，故选A。
根据句意只有A选项是正确的，其它选项翻译不通，故选A。
【点评】此题考查连词辨析。
弄清每个连词意思，根据语境和句意确定所使用的连词。
8．After the new high-speed railway line began operations, the time on the trip from Lianyungang to Qingdao now is much less than __________in the past.A. oneB. thisC. thatD. it【答案】 C【解析】【分析】句意：新高速铁路开通后，连云港到青岛的时间比过去少了很多。
A：one，一，同类中的一个；B：this（指时间、距离较近或下文要提到的人或事物）这个；C：that，（指时间、距离较远或指上文提到过人或事物）那，那个；D：it它指与上文的同一个。
根据 the time on the trip from Lianyungang to Qingdao now，可知是指上文提到过时间，要用that。
故选C。
【点评】考查连词辨析。
理解选项意思和用法，根据句子的语法结构，选择正确的连词。
9．You'd better travel around Nanjing with a local tour guide ______________ you want to know more about its culture.A. unlessB. untilC. althoughD. if【答案】 D【解析】【分析】句意：如果你想了解南京的文化，最好带着当地的导游游览一下。
A：unless除非；B： until 直到……才（为止）；C： although 尽管；D： if如果。
导游带领游览是了解南京的条件，因此要用从属连词if，故选D。
【点评】考查连词辨析。
理解连词的词义和用法，根据前后句的关系，选择正确的连词。
10．You'll have a great time ______________ you go to the party.A. soB. ifC. although【答案】 B【解析】【分析】句意：如果你去参加聚会，你会玩得很开心的。
A：so因此，表示结果； B： if 如果，表示条件；C： although尽管，表示让步。
根据前后句的意思，可知后句是前句的条件，故选B。
【点评】考查连词辨析。
理解连词意思和用法，根据前后句的关系，选择正确的连词。
11．______________ China has been a member of WTO, English is more important.A. SinceB. ThoughC. WhenD. If【答案】 A【解析】【分析】句意：自从中国加入WTO后，英语就更重要了。
since自从，though虽然；when当……时候；if如果，只有since是正确的，though放在此处句子翻译不通顺；when不和现在完成时连用；if引导从句是一般现在时或现在完成时，主句用将来时，故选A。
【点评】考查连词辨析。
根据句意确定所使用的连词。
12．_____________ Chinese, we study English, Maths and physics in school.A. ExceptB. BesidesC. BesideD. Without【答案】 B【解析】【分析】句意：除了语文，在学校我们还学习英语，数学和物理。
A： Except，除了……，不包括后面的部分。
B：Besides，除了……还有，包括后面的部分。
C：Beside，在……旁边。
D： Without，没有。
根据Chinese, we study English, Maths and physics in school.可知，在学校我们要学习语文，数学，英语和物理，所以包括语文，要用besides，故选B。
【点评】考查连词辨析。
注意词意和用法，结合句意和语境，选出正确答案。
13．— Would you like to go camping this weekend?— I'd love to, ______________ I can't. I have to prepare for the English Speech Contest.A. andB. orC. butD. so【答案】 C【解析】【分析】句意：——这个周末你想去野营吗？——我很想去，但不行。
我得准备英语演讲比赛。
A 和，表示并列或顺承；C 或者，表示选择；C 但是，表示转折；D 因此，表示结果。
根据答语中的I'd love to, 与I can't. I have to prepare for the English Speech Contest.可知，这两个语句表示转折，要用but，故选C。
【点评】考查连词辨析。
注意每个连词的含义及用法，根据语境确定最佳选项。
14．He knows a lot, ________ he is just a child.A. howeverB. thoughC. andD. because【答案】 B15．— ________ will the meeting last?— we reach an agreement.A. How long; Not untilB. When; Not untilC. How long; UntilD. When; Till【答案】 C【解析】【分析】句意：——会议会持续多久？——直到我们达成协议。
last是持续动词，提问持续动词所持续的时间用how long，故排除B和D选项，until表示动作的持续，故选C。
【点评】考查连词，注意how long和until的用法。
16．What shall we do___________ it rains tomorrow?A. ifB. whileC. sinceD. and【答案】 A【解析】【分析】句意：如果明天下雨，我们该怎么办? A.如果；B.当……时候；C.自从；D.而且。
根据前后句句意可知，此处应该是if引导的条件状语从句，时态根据主将从现原则，故选A。
【点评】考查连词辨析。
注意if引导的条件状语从句，时态根据主将从现原则。
17．Mr. Smith is very rich, ________ he doesn't feel happy.A. andB. orC. butD. so【答案】 C【解析】【分析】句意：史密斯先生非常有钱，但是他感觉不开心。
very rich非常有钱和后面的doesn't feel happy，感觉不开心是转折关系，but但是，表转折，故选C。
【点评】考查连词，根据句意来选择合适的连词。
18．The teacher got angry _________________ what we had done in class yesterday.A. becauseB. because ofC. asD. but【答案】 B【解析】【分析】句意：老师因为我们昨天在课堂上做的事情感到生气。
A因为，引导原因状语从句，B因为，引导名词从句，C由于，引导原因状语从句，D但是，what we had done in class yesterday是名词从句，故用because of引导，故选B。
【点评】考查代词辨析，注意because of的用法。
19．Take more exercise, you will be healthier.A. butB. orC. and【答案】 C【解析】【分析】句意：多锻炼，那么你将会更健康。
