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"I can‘t imagine why he is late." "Nor can I.He______an acci

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"I can‘t imagine why he is late." "Nor can I.He______an accident." (2 分)
A.might have
B.may have
C.might have had
D.could have
C might have done 表示对过去事情的推测,说话人不太有把握
我实在想象不出他怎么迟到了.我也不知道,他可能出事了.
其实must/can/could/may/might + have done都可以表示对过去事情的推测,只是语气强弱不同,把握性有大到小.