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19. This is the key _____..

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19. This is the key _____..
  19. This is the key _____.
  A. which you are looking for   B. for which you are looking
  C. for that you are looking   D. you are looking for which
选B为什么错?
look 是不及物动词,接宾语要跟介词,look for 不能分开
正确答案是A