The room is in a terrible mess; it ________ cleaned.

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问题 The room is in a terrible mess; it ________ cleaned.

选项 A、can’ t have been
B、shouldn’ t have been
C、mustn’ t have been
D、wouldn’ t have been

答案C

解析本题考查情态动词完成式表过去推测的用法。must (not) have done表示对过去发生的情况做出的肯定 (否定) 的推测。句意：这个屋子乱成一团糟，它一定没有被打扫过。

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