--A man answered the phone, I suppose it was her husband. --It her husband. He has been dead for ages. [ ] A．mustn't beB．mustn't have been C．couldn't beD．couldn't have been 题目和参考答案——青夏教育精英家教网—

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--A man answered the phone, I suppose it was her husband.

--It ____ her husband. He has been dead for ages.

[　　]

A．mustn't be

B．mustn't have been

C．couldn't be

D．couldn't have been

答案：
解析：

上句用了一般过去时，可知此处是对过去的事实进行推测。could not have done表示“不可能做了某事”。

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