This room is in a terrible mess it______cleaned.

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问题 This 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A

解析句意：这个房间这么乱，一定没有被打扫过。can’t have been表示对过去的推测。

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考研英语一

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