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英语
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The room is in a terrible mess,it ___ cleane;
a、can’t have been
b、shouldn’t have been
c、mustn’t have been
d、wouldn’t have been
人气：241 ℃ 时间：2020-02-02 10:24:56
解答
这个应该是虚拟语气吧,不可能已经干净了,应该是D,过去式表虚拟
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