题目内容
-A woman answered the phone. I suppose it was his wife.
-It ________ his wife. She has been dead for ages.
- A.mustn't be
- B.mustn't have been
- C.couldn't be
- D.couldn't have been
D
根据所说的情况可知,是对过去事情的推测,排除A、C选项;must表示推测不能用于否定句,所以应选D表示对过去事情的否定推测。
根据所说的情况可知,是对过去事情的推测,排除A、C选项;must表示推测不能用于否定句,所以应选D表示对过去事情的否定推测。
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