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、couldn’t have been
B、shouldn’t have been
C、mustn’t have been
D、wouldn’t have been

答案A

解析 couldn’t have done:(过去)不可能做了……,表示对过去情况的否定推测;shouldn’t have done:(过去)本不该做……(却做了);must have done:(过去)一定做了……,表示对过去情况的肯定推测,不存在mustn’t have done这种形式;wouldn’t have done-常用于对过去情况的假设,意为“(过去)不会做……”。根据句意可知,选A。
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