-A man answered the phone. I suppose it was her husband. -It her husband．He has
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—A mananswered 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
试题答案
答案：D
解析：| 有根据的推断用could，再结合时态考虑应选D。
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