-Awomanansweredthephone.Isupposeitwashiswife.-It________hiswife.Sheh

发布时间：2020-08-04 15:33:07

-A woman answered the phone. I suppose it was his wife.-It ________ his wife. She has been dead for ages.A.mustn't beB.mustn't have beenC.couldn't beD.couldn't have been

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D解析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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