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高一定语从句分析高级运用练习50题含答案解析1.The man who/whom/whose is standing there is my teacher.whowhomwhose答案解析：who。
本题中先行词是man，在从句中作主语，所以用who。
whom 在从句中作宾语，whose 表示所属关系，后面要接名词。
2.The woman with whom/whose/that I talked is very kind.whomwhosethat答案解析：whom。
先行词是woman，在从句中作talk with 的宾语，所以用whom。
whose 表示所属关系，that 在定语从句中可作主语或宾语，但这里强调与某人交谈，用whom 更合适。
3.The boy whose/that/who book is on the desk is my classmate.whosethatwho答案解析：whose。
先行词是boy，后面的book 与boy 是所属关系，所以用whose。
that 和who 在从句中不能表示所属关系。
4.The girl who/whom/whose I met yesterday is very beautiful.whomwhose答案解析：who。
先行词是girl，在从句中作met 的宾语，但是在口语和非正式文体中，who 也可以代替whom 作宾语。
whose 表示所属关系，不符合题意。
5.The teacher whose/that/who class is very interesting is popular among students.whosethatwho答案解析：whose。
先行词是teacher，后面的class 与teacher 是所属关系，所以用whose。
that 和who 在从句中不能表示所属关系。
6.The man who/whom/whose car is red is a doctor.whowhomwhose答案解析：whose。
高一定语从句练习50题(答案解析)1.The man who/that is standing there is my teacher.A.whoB.thatC.whomD.which答案：A 或B。
解析：先行词是man，指人，在定语从句中作主语，所以可以用who 或that。
whom 只能作宾语，which 只能指物。
2.The book which/that I bought yesterday is very interesting.A.whoB.thatC.whomD.which答案：B 或D。
解析：先行词是book，指物，在定语从句中作宾语，所以可以用that 或which。
who 和whom 只能指人。
3.The girl whom/who/that I met yesterday is very kind.A.whoB.thatC.whomD.which答案：A 或B 或C。
解析：先行词是girl，指人，在定语从句中作宾语，所以可以用whom、who 或that。
which 只能指物。
4.The house which/that is near the park is very beautiful.A.whoB.thatC.whomD.which答案：B 或D。
解析：先行词是house，指物，在定语从句中作主语，所以可以用that 或which。
who 和whom 只能指人。
5.The boy who/that likes playing basketball is very tall.A.whoB.thatC.whomD.which答案：A 或B。
解析：先行词是boy，指人，在定语从句中作主语，所以可以用who 或that。
whom 只能作宾语，which 只能指物。
6.The woman whom/who/that I talked to is very friendly.A.whoB.thatC.whomD.which答案：A 或B 或C。
高一英语定语从句解析练习题50题(答案解析)1.This is the man ______ helped me yesterday.A.whoB.whomC.thatD.which答案解析：A。
“man”是人，在定语从句中作主语，关系代词用who。
whom 一般在定语从句中作宾语；that 既可以指人也可以指物，但在此处不如who 明确表示人且作主语；which 只能指物。
2.The book ______ I bought yesterday is very interesting.A.thatB.whichC.whoD.whom答案解析：A 或B。
“book”是物，关系代词that 和which 都可以指物引导定语从句。
who 和whom 只能指人。
3.The girl ______ we met at the party is very friendly.A.whoB.whomC.thatD.which答案解析：A 或C。
“girl”是人，在定语从句中作宾语，关系代词用who 和that 都可以。
whom 一般在定语从句中作宾语，但不如who 和that 常用；which 只能指物。
4.The teacher ______ teaches us English is very kind.A.whoB.whomC.thatD.which答案解析：A 或C。
“teacher”是人，在定语从句中作主语，关系代词用who 和that。
whom 一般在定语从句中作宾语；which 只能指物。
5.The house ______ we live in is very big.A.thatB.whichC.whoD.whom答案解析：A 或B。
“house”是物，关系代词that 和which 都可以指物引导定语从句。
who 和whom 只能指人。
6.The man ______ I talked to is my uncle.A.whoB.whomC.thatD.which答案解析：A 或B。
高一英语定语从句练习题20题(答案解析)1.The man ______ is wearing a blue shirt is my teacher.A.whoB.whomC.whoseD.which答案解析：A。
“The man”是人，在定语从句中作主语，所以用关系代词who。
whom 在定语从句中作宾语；whose 表示所属关系；which 用于指代物。
2.The book ______ I bought yesterday is very interesting.A.thatB.whichC.whoD.whom答案解析：A 和B。
先行词“book”是物，关系代词that 和which 都可以用来指代物在定语从句中作宾语。
who 和whom 用于指代人。
3.The girl ______ hair is long is very beautiful.A.whoB.whomC.whoseD.which答案解析：C。
“The girl”是人，“hair”与“girl”是所属关系，所以用关系代词whose，表示“……的”。
who 和whom 在定语从句中分别作主语和宾语；which 用于指代物。
4.The man ______ I talked to just now is a famous scientist.A.whoB.whomC.whoseD.which答案解析：A 和B。
“The man”是人，在定语从句中作“talked to”的宾语，所以用关系代词whom，也可以用who。
whose 表示所属关系；which 用于指代物。
5.The house ______ we live in is very old.A.thatB.whichC.whoD.whom答案解析：A 和B。
先行词“house”是物，关系代词that 和which 都可以用来指代物在定语从句中作宾语。
who 和whom 用于指代人。
高一定语从句练习50题带答案1. I like the book ______ tells an interesting story.A. whoB. whomC. whoseD. which答案：D。
解析：先行词是book，为物，在定语从句中作主语，which可用来指代物且在从句中作主语，所以选which。
who和whom用来指人，不能指代book，所以A和B错误。
whose表示所属关系，在句中不符合语境，所以C错误。
2. The boy ______ mother is a doctor is my friend.A. whoB. whomC. whoseD. which答案：C。
解析：先行词是the boy，这里表示男孩的妈妈，需要表示所属关系的关系代词，whose表示所属关系，意为“某人的”，所以选C。
who和whom 用来指人，但不表示所属关系，所以A和B错误。
which用来指物，不能指人，所以D错误。
3. Do you know the man ______ we met yesterday?A. whoB. whomC. whose答案：A。
解析：先行词是the man，在定语从句中作met的宾语，但是在从句中缺少的是主语的成分，因为we met the man，这里the man是主语，who 既可以作主语也可以作宾语，所以选A。
whom只能作宾语，这里从句需要主语，所以B错误。
whose表示所属关系，不符合语境，所以C错误。
which用来指物，不能指人，所以D错误。
4. She is the girl ______ I gave a book to.A. whoB. whomC. whoseD. which答案：B。
解析：先行词是the girl，在定语从句中作to的宾语，whom专门用来作宾语，指人，所以选B。
who虽然也可以作宾语，但是whom更正式地用于作宾语的情况。
whose表示所属关系，不符合语境，所以C错误。
高一定语从句练习40题1.This is the book ____ was written by Lu Xun.A.thatB.whichC.whoD.whom答案解析：A 和B。
本题考查关系代词的用法。
先行词是book，是物，所以关系代词可以用that 或者which。
who 和whom 是用来指代人的关系代词，不适合本句。
2.The man ____ we met yesterday is a famous scientist.A.whoB.whomC.whoseD.which答案解析：A。
先行词是man，是人，且在从句中作主语，所以用who。
whom 在从句中作宾语；whose 表示所属关系；which 用来指代物。
3.The girl ____ hair is long is my classmate.A.whoB.whomC.whoseD.that答案解析：C。
先行词是girl，hair 与girl 是所属关系，所以用whose，表示“……的”。
who 和whom 用来指代人，但不是所属关系；that 可指代人或物，但也不是所属关系。
4.The movie ____ I watched last night was very interesting.A.thatB.whichC.whoD.whom答案解析：A 和B。
先行词是movie，是物，关系代词可用that 或which。
who 和whom 指代人，不适合本句。
5.The teacher ____ teaches us English is very kind.A.whoB.whomC.whoseD.which答案解析：A。
先行词是teacher，是人，且在从句中作主语，所以用who。
whom 在从句中作宾语；whose 表示所属关系；which 指代物。
6.The house ____ we lived in when I was a child is very old.A.thatB.whichC.who答案解析：A 和B。
高一定语从句练习40题1.The man ______ is wearing a blue shirt is my teacher.A.whoB.whomC.that答案解析：A 和C。
先行词是man，在定语从句中作主语，关系代词who 和that 都可以在定语从句中作主语，whom 只能作宾语，所以答案是who 和that。
2.The girl ______ I met yesterday is very kind.A.whoB.whomC.that答案解析：A、B 和C。
先行词是girl，在定语从句中作宾语，关系代词who、whom 和that 都可以在定语从句中作宾语，所以三个选项都正确。
3.The boy to ______ I talked is from America.A.whoB.whomC.that答案解析：B。
先行词是boy，在定语从句中作介词to 的宾语，关系代词只能用whom，who 和that 不能用在介词后面作宾语。
4.The woman ______ son is a doctor is very proud.B.whomC.that答案解析：A 和C。
先行词是woman，在定语从句中作定语从句的主语，关系代词who 和that 都可以在定语从句中作主语，whom 只能作宾语，所以答案是who 和that。
5.The man ______ we saw at the park is my uncle.A.whoB.whomC.that答案解析：A、B 和C。
先行词是man，在定语从句中作宾语，关系代词who、whom 和that 都可以在定语从句中作宾语，所以三个选项都正确。
6.The teacher ______ teaches us English is very patient.A.whoB.whomC.that答案解析：A 和C。
先行词是teacher，在定语从句中作主语，关系代词who 和that 都可以在定语从句中作主语，whom 只能作宾语，所以答案是who 和that。
高一定语从句练习50题带答案解析1.The man ____ is wearing a blue shirt is my teacher.A.whoB.whomC.whose答案解析：A。
本题中先行词是man，在从句中作主语，所以用who。
whom 只能在从句中作宾语，whose 表示所属关系。
2.The woman ____ I met yesterday is a doctor.A.whoB.whomC.whose答案解析：B。
先行词woman 在从句中作宾语，所以用whom。
who 不能作宾语，whose 表示所属关系。
3.The boy ____ bag is red is very clever.A.whoB.whomC.whose答案解析：C。
先行词boy 和bag 是所属关系，所以用whose。
who 和whom 都不能表示所属关系。
4.The girl ____ is singing is very beautiful.A.whoB.whomC.whose答案解析：A。
先行词girl 在从句中作主语，所以用who。
whom 作宾语，whose 表示所属关系。
5.The man ____ we saw just now is a famous writer.A.whoB.whomC.whose答案解析：A。
先行词man 在从句中作宾语，但是在动词saw 后面可以用who 或whom，但是这里who 更常用。
whose 表示所属关系。
6.The teacher ____ class is very interesting is very popular.A.whoB.whomC.whose答案解析：C。
先行词teacher 和class 是所属关系，所以用whose。
who 和whom 都不能表示所属关系。
7.The student ____ answered the question correctly is very smart.A.whoB.whomC.whose答案解析：A。
高一定语从句练习50题含答案解析1.This is the man ______ helped me yesterday.A.whoB.whomC.whose答案解析：A。
“who”在定语从句中作主语，指人。
本句中“who helped me yesterday”修饰“the man”，“who”在从句中作主语，意为“帮助我的那个人”。
“whom”在定语从句中作宾语；“whose”表示所属关系。
2.The girl ______ I met at the party is very friendly.A.whoB.whomC.whose答案解析：A。
“who”在定语从句中作主语，指人。
本句中“who I met at the party”修饰“the girl”，“who”在从句中作主语，意为“我在聚会上遇到的那个女孩”。
“whom”在定语从句中作宾语；“whose”表示所属关系。
3.The teacher ______ class is very interesting is Mr. Wang.A.whoB.whomC.whose答案解析：C。
“whose”在定语从句中表示所属关系，意为“……的”。
本句中“whose class is very interesting”修饰“the teacher”，“whose”表示“老师的”，即“课很有趣的那个老师是王老师”。
“who”在定语从句中作主语，“whom”在定语从句中作宾语。
4.The woman ______ he is talking to is his mother.A.whoB.whomC.whose答案解析：B。
“whom”在定语从句中作宾语，指人。
本句中“he is talking to”缺少宾语，“whom”在从句中作“talking to”的宾语，意为“他正在和说话的那个女人是他的母亲”。
“who”在定语从句中作主语，“whose”表示所属关系。
高一英语定语从句分析高级练习题30题1.The man who/whom/whose/that/which is standing there is my teacher.whowhomwhosethatwhich答案：who/that。
“who”和“that”都可以指人，在从句中作主语。
“whom”在从句中作宾语；“whose”表示所属关系；“which”只能指物。
此句中关系词在从句中作主语且指人，所以可以用“who”或“that”。
2.The book which/that/whose I bought yesterday is very interesting.whichthatwhose答案：which/that。
“which”和“that”都可以指物，在从句中作宾语。
“whose”表示所属关系。
此句中关系词在从句中作宾语且指物，所以可以用“which”或“that”。
3.The girl whose/that/which hair is long is very beautiful.whosethatwhich答案：whose。
“whose”表示所属关系，在此句中指“女孩的”头发。
“that”和“which”不能表示所属关系。
4.The house which/that/whose we visited last week is very old.whichthatwhose答案：which/that。
“which”和“that”都可以指物，在从句中作宾语。
“whose”表示所属关系。
此句中关系词在从句中作宾语且指物，所以可以用“which”或“that”。
5.The man whom/that/which/who I talked to is my neighbor.whomthatwhichwho答案：whom/who/that。
“whom”在从句中作宾语且指人；“who”在从句中作主语或宾语且指人；“that”既可以指人也可以指物，在从句中作主语或宾语。
定语从句分类练习谁是先行词？1. Mr. Smith is the only one of those foreigners who ____ in China now.A. worksB. is workingC. are workingD. have been working2. He is one of the students who ___ to Beijing.A. have visited inB. has goneC. has paid a visitD. have been是人还是物？3. The family ____ lost everything in a big fire will get much help from their friends.A. which hasB. which isC. who haveD. who has不定代词4. There is little ____ remains to be done.A. whichB. thatC. whatD. but地点作为先行词5. This is the second school ____ I used to work at, many students of ___ still have a good relationship with me.A. where, thatB. that, whichC. which, whichD. that, that6. Is there a shop around ___ we can get fruit?A. on whichB. for whichC. whereD. which7. Have you ever been to the temple ____ stands a tower?A. thatB. round whichC. whichD. where8. Let me think of a proper situation ____ this idiom can be used.A. whereB. ThatC. whichD. for which时间为先行词9. This was at a time ____ there was no radio, TV or cinema.10. This is the third time ____ I have done such an experiment.A. whenB. thatC. whichD. in which11. I remained in the office until 5:30 ____ all the others had left.A. at which B when C. by which time D. that方式way做先行词12. I like the way ____ he talks and laughs.A. whichB. in whichC. whenD. for which13. I watched the way ____ her arms and legs moved and the funny movements made me laugh.A. whichB. whereC. in thatD. that介词宾语14. In the dark street, there was not a single person ____ he could turn for help.A. thatB. whoC. from whomD. to whom15. That’s the dog ____.A. we’ve been looking afterB. after which we’ve been lookingC. what we’ve been looking afterD. we’ve been taking care for16. China has many rivers, ____ the Changjiang River is the longest.A. whichB. in whichC. among whichD. one of whichwhose 用法17. Chaplin, for_____ money was now no problem, started a new film company with his friends.18. I decided to write about Chaplin, one of ______ films I had seen several years before.A. whichB. whoseC. whomD. whoas 用法辨析19. Don’t talk about such things ___ you don’t understand.A. whichB. thatC. asD. whose20. As many members ____ were present agreed to the plan.A. whoB. thatC. whichD. as21. As many members ____ were present agreed to the plan, we have to carry it out.A. whoB. whomC. asD. which22. She is good at dance, ____ everybody knows.A. thatB. whichC. whoD. as23. He said that he was invited, ____ was a lie.A. thatB. asC. itD. which定语从句的疑问句式24. Is this the leaning tower ____ Galieo did experiments centuries ago?A. thatB. whereC. whichD. when25. Is ______ some German friends visited last week?A. this schoolB. this the schoolC. this school oneD. this school where定语从句与插入语26. We’ll call on the man ___ we think can speak very good English.A. whoB. whomC. whoeverD. which27. In front of me was a woman ___ I supposed to be my aunt.A. whoseB. whomC. whoeverD. whomever28. He left the money with his friend, ____ he believes was useful to him.A. whoB. whatC. itD. which29. I’ll give it to ____ I conside r is eager to get it.A. whoB. anyoneC. whoeverD. whomever定语从句与不定式30. She hasn’t got enough money ___ to buy the necklace.A. whichB. for which C . with which D. that31. Because of air pollution being reduced, this city is still ____.A. a good place in which to liveB. lived as a good placeC. a good place to live inD. living in as a good place定语从句与其他相似句型32. Is this book ____ you bought the other day?A. thatB. whatC. oneD. which33. It is I ____ your best friend ____ can help you out.A. am; thatB. who is; thatC. who am, whoD. who am; whom34. Please put the magazine ____.A. in which they wereB. as they wereC. where it wasD. there it was35. It was in 1969 ____ the American astronaut succeeded in landing on the moon.A. thatB. whenC. in whichD. which36. You should make it a rule to leave things ____ you can find them again.A. in whichB. in the placeC. whereD. how37. John got the first place and ____ made his parents happy.A. whichB. thatC. asD. what38. We can’t know everything ____ is going on in the world.A. thatB. whatC. whichD. there一、定语从句易混点对比专练1.①The man ______ she married last year was a soldier.A. whomB. to whomC. with whomD. whose②The man ______ she was married was a soldier.A. whomB. to whomC. with whomD. who2.①The day ______ she spent with us was never to be forgotten.A. /B. on whichC. whenD. in which②The day ______ she played with us was never to be forgotten.A. thatB. whenC. whichD. /3. ①Is this the factory ______ you visited last weekA. whereB. whichC. to whichD. in which②Is this factory ______ you visited last weekA. that B which C in which D. the one4. ①The house ______ window faces south is for the doctor.A. whichB. thatC. whoseD. of which②The house ______ faces south is for the doctor.A. whichB. whoseC. whoD. where5. ①She brought forward a plan ______ we couldn't agree.A. thatB. whichC. /D. to which②She brought forward a plan ______ we couldn't accept.A. /B. for whichC. to which D .of which6. ①The invention ______ she spent 2 years will do well to the world.A. whichB. /C. on whichD. when②The invention ______ took her 2 years will do well to the world.A. whichB. /C. on whichD. it7. ①The English subject, ______ I do well, is important in middle schools.A. whichB. thatC. in whichD. at which②The English subject, ______ I have mastered well, is important in middle school.A. whichB. at whichC. thatD. in which8. ①Tom, ______ I went to the concert, is a friend of mine.A. whomB. whoC. with whomD. whose②Tom,______ bicycle 1 went to the concert,is a friend of mine.A. whomB. whoC. whoseD. on whose9.①The place ______ you visited during your holidays is where I used to be for years.A. whereB. whichC. in whichD. to which②The place _______ you stayed for 3 years is where an ancient city used to be.A. whereB. whichC. thatD. to which10.①She will fly to Washington,______ is the capital of the U.S.A. thatB. whereC. whichD. in which②She will fly to Washington,______ she can enjoy herself.A. whereB. thatC. whichD./11.①The story happened on a day ______ the weather was wet and cold.A. whenB. whichC. in whichD. on when②The story happened on a day ______ was wet and cold.A. thenB. on whichC. whichD./12.①The sun heats the earth,______ we all know.A. thatB. whichC. asD. where②The sun heats the earth,______ makes it possible to grow crops.A. whichB. thatC. asD. where13.①Tom,______ we had expected, got the 1st place in the competition.A. asB. whichC. whomD. who②Tom,______ we had expected to help us, didn't even show his face .A. asB. whomC. thatD. which二、定语从句精选练习50题1. Such things of __________ you are not sure should be discussed again.A. whichB. whatC. asD. those2. Is this the factory __________ you visited the other day?A. thatB. whereC. in whichD. the one3. Is this factory __________ some foreign friends visited last Friday?A. thatB. whereC. whichD. the one4. Is this the factory __________ he worked ten years ago?A. thatB. whereC. whichD. the one5. The wolves hid themselves in the places ________couldn’t be found.A. thatB. whereC. in whichD. in that6. The freezing point is the temperature _____ water changes into ice.A. at whichB. on thatC. in whichD. of what7. This book will show you __________ can be used in other contexts.A. how you have observedB. what you have observedC. that you have observedD. how that you have observed8. The reason is __________ he is unable to operate the machine.A. becauseB. whyC. thatD. whether9. I’ll tell you __________ he told me last week.A. all whichB. thatC. all thatD. which10. That tree, __________ branches are almost bare, is very old.A. whoseB. of whichC. in whichD. on which11. I have bought the same dress __________ she is wearing.A. asB. thatC. whichD. what12. He failed in the examination, __________ made his father very angry.A. whichB. itC. thatD. what13. We’re talking about the piano and the pianist ____ were in the concert we attended last night.A. whichB. whomC. whoD. that14. The girl _________an English song in the next room is Tom’s sister.A. who is singingB. is singingC. sangD. was singing15. Those _____not only from books but also through practice will succeed.A. learnB. whoC. that learnsD. who learn16. Anyone __________ this opinion may speak out.A. that is againstB. that againstC. who is againstD. who are against17. Didn’t you see the man __________?A. I nodded just nowB. whom I nodded just nowC. I nodded to him just nowD. I nodded to just now18. Can you lend me the novel __________ the other day?A. that you talkedB. you talked about itC. which you talked withD. you talked about19. Is there anything __________ to you?A. that is belongedB. that belongsC. that belongD. which belongs20. ---- How do you like the book?---- It’s quite different from __________ I read last month.A. thatB. whichC. the oneD. the one what21. Mr. Zhang gave the textbook to all the pupils except _______ who had already taken them.A. the onesB. onesC. someD. the others22. The train __________ she was traveling was late.A. whichB. thatC. on whichD. in that23. He has lost the key to the drawer __________ the papers are kept.A. whereB. thatC. under whichD. which24. Antarctic _____ we know very little is covered with thick ice all the year round.A. whichB. about thatC. thatD. about which25. It’s the third time __________ late this month.A. that you arrivedB. when you arrivedC. that you’ve arrivedD. when you’ve arrived26. It was in 1969 ______ the American astronaut succeeded in landing on the moon.A. thatB. whichC. whenD. in which27. May the fourth is the day ______ we Chinese people will never forget.A. whichB. whenC. on whichD. about which28. We are going to spend the Spring Festival in Guangzhou, _________ live my grandparents and some relatives.A. whichB. thatC. whoD. where29. The hotel __________ during our holidays stands by the seaside.A. we stayed atB. where we stayed atC. we stayedD. in that we stayed30. Is it in that factory __________ “Red Flag” cars are produced?A. in whichB. whereC. whichD. that31. It is the Suez Canal __________ separates Asia __________ Africa.A. which, toB. where, fromC. that, fromD. that, with32. Under the bridge, however, almost directly below, ______ was a small canoe, with a boy in it.A. thereB. whereC. itD. which33. He is not __________ a fool __________.A. such, as he is lookedB. such, as he looksC. as, as he is lookedD. so, as he looks34. Is that the reason __________ you are in favour of the proposal?A. whichB. whatC. whyD. for that35. He must be from Africa, __________ can be seen from his skin.A. thatB. asC. whoD. what36. He has two sons, __________ work as chemists.A. two of whomB. both of whomC. both of whichD. all of whom37. I, __________ your good friend, will try my best to help you out.A. who isB. who amC. that isD. what is38. He is a man of great experience, __________ much can be learned.A. whoB. thatC. from whichD. from whom39. ---- Do you know the town at all?---- No, this is the first time I __________ here.A. wasB. have beenC. cameD. am coming40. I don’t like __________ you speak to her.A. the wayB. the way in thatC. the way whichD. the way of which41. The two things _________ they felt very proud are Jim’s gold watch and Della’s hair.A. about whichB. of whichC. in whichD. for which42. The dinner was the most expensive meal we __________.A. would haveB. have hadC. had never hadD. had ever had43. Do you know which hotel __________?A. she is stayingB. she is staying inC. is she stayingD. is she staying in44. There is only one thing __________ I can do.A. whatB. thatC. allD. which45. Who can think of a situation __________ this idiom can be used?A. whichB. thatC. whereD. in that46. I have many books, some of __________ are on chemistry.A. themB. thatC. whichD. those47. They were interested __________ you told them.A. in whichB. in thatC. all thatD. in everything48. The astronaut did many experiments in the spaceship, _____ much help for knowing space.A. which we think it isB. which we think are ofC. of which we think isD. I think which is of49. The great day we looked forward to __________ at last.A. comeB. cameC. comingD. comes50. I like the second football match __________ was held last week.A. whichB. whoC. thatD. /。
