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---Did Mary come to the party?

---I don’t know.She ______while I was out.


  1. A.
    may have come
  2. B.
    must have come
  3. C.
    might come
  4. D.
    could come
A
试题分析:这题考查情态动词的完成式的用法:从第一句话知道是指过去的事,从-I don’t know,知道是可能已经来了。用may have come,A项正确。
考点:考查情态动词的完成式
点评:情态动词的完成式有两种用法:一种是对过去情况的推测,一种是对过去的虚拟,做题时要结合上下文来判断。还要注意情态动词的语气。
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