Sorry I’m late. I_______ have turned off the alarm clock and gone back to sleep again.

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问题 Sorry I’m late. I_______ have turned off the alarm clock and gone back to sleep again.

选项 A、might
B、should
C、mustn’t
D、couldn’t

答案A

解析 may/might have done表示对过去情况的一种不太有把握的推测,must have done用于肯定句,表示“过去一定做过某事”,是很有把握的推测。其否定形式为can’t/couldn’t have done。该题前句说明了结果,后句接着说出了产生这种结果的可能性,对前句进行补充说明,分析选项可知本题应选A。should have done表示本应该做某事却没有做,不符句意。
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