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Their answers are exactly the same — one of them ______ from the other


  1. A.
    must copy
  2. B.
    must have copied
  3. C.
    should copy
  4. D.
    should have copied
B
解析:
句意:他們的答案一模一樣——他的當中一個人一定抄襲了另一個人。根據句意,抄襲這個動作發(fā)生在過去,排除A,C兩項,B過去一定做了某事D本應該做某事而實際沒做,故選B
考點:考查情態(tài)動詞。
點評:情態(tài)動詞+have done ,表示對過去的虛擬或推測。記住這些結構的意思:shouldn’t have done 本不應該做某事,實際上卻做了;needn’t have done本不需要做某事,實際上卻做了。can’t/couldn’ t have done不可能做了某事,
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