2. 外语
  3. Sorry I’m late. I ______ have turned off the alarm clock and gone back to sleep again.

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

admin2014-03-10  35
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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