单选题The room is in a terrible mess; it ______ cleaneAcan't have beenBmustn't have beenCshouldn't have beenDwouldn't have been
单选题
The room is in a terrible mess; it ______ cleane
A
can't have been
B
mustn't have been
C
shouldn't have been
D
wouldn't have been
参考解析
解析：
句意：房间里一团糟，不可能被打扫过。表示否定推测要用can’t，又因为是对过去的推测，所以要用完成时。
句意：房间里一团糟，不可能被打扫过。表示否定推测要用can’t，又因为是对过去的推测，所以要用完成时。
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