--Amanansweredthephone,Isupposeitwasherhusband.--It____herhusband.He

发布时间：2020-08-07 01:25:58

--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 beenC.couldn't beD.couldn't have been

网友回答

D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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