关系代词Whose和Which引导的定语从句
  1】Whose  
  人、物皆可，做定语，后面要紧跟被修饰的名词，先行词和后面的名词之间往往是从属关系。
  There are some people whose faces you can never forget. 
  有些人，他们的脸你永远难以忘怀。（定语从句修饰先行词people）
  I saw some trees whose leaves were black because of the polluted air. 
  我看见一些树的树叶由于空气污染而发黑。（定语从句修饰行词trees）
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  2】Which 
  1．指物，在定语从句中做主语或宾语。做宾语时常可省略。
  English is a language which is easy to learn. 
  英语是一门容易学的语言。（which在定语从句中作主语，不能省略）
  The children like cookies (which) my wife makes. 
  孩子们喜欢我夫人做的饼干。(关系代词which作makes的宾语，可以省略)
  2．which引导的非限制性定语从句可以修饰前面的整个主句，相当于and this。
  Jim passed his driving test, which surprised everybody. 
  吉姆通过了驾驶考试，这使大家都感到惊讶。（定语从句修饰的是整个主句，而不是the driving test）
  Sheila couldn't come to the party, which was a pity. 
  希拉不能来参加聚会，真遗憾。（定语从句修饰的是整个主句，而不是the party）
  3．which在非限制性定语从句中有时也可以作定语。
  John stayed here for a week, during which time we visited the West Lake together.
  约翰在这里呆了一星期，在此期间我们一起游了西湖。
  It might snow this weekend, in which case we won't go to Beijing. 
  周末可能下雪，在这种情况下，我们就不去北京了。

1. I am sorry that he ________ in such poor health.
    A. are                  B. shall be     C. were                D. should be
2. That is a good book. You ________ it yesterday.
    A. could buy           B. should buy   C. should have bought    D. bought
3. It is high time we ________ home.
    A. will go             B. would go C. have gone D. went
4. I ' d rather that you ________ home.
    A. went B. have gone C. will go D. had gone
5. If only I _________ to the lecture!
    A. listen B. will listen     C. am listening D. had listened
6. ---- If he_____  , he ______ that food. ---- Luckily he was sent to the hospital immediately.
    A. was warned; would not take B. had been warned; would not have taken
    C. would be warned; had not taken D. would have been warned; had not taken
7.I didn' t see your sister at the meeting. If she _________, she would have met my brother.
    A. has come           B. did come C. came            D. had come
8. Without electricity, human life ________ quite different today.
    A. is              B. will be C. would have been     D. would be
9. He ________ you more help, even though he was very busy.
A. might have given B. might give C. may have given D. may give
10. If city noises _______ from increasing, people _______ shout to be heard even at the dinner table 20 years from now.
   A. are not kept; will have to B. are not kept; have to
   C. do not keep; will have to D. do not keep; have to

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