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12.She ______ called to say sorry to me,but my mobile phone was power-off all day long.(  )
A.needn't haveB.should haveC.could haveD.mustn't have

分析 她可能打电话想向我道歉,可我的手机一整天都关机了.

解答 答案:C 句意表达的是对过去的推测;对过去的推测要用情态动词加完成时态;needn't have done本不需要做某事,should have done本应该做某事,D项是错误搭配.故选C.

点评 情态动词的用法是英语中常考的语言点.通常考查的方式有虚拟和推测,本题考查的是情态动词的推测用法.学习时要注意积累.

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