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

答案A

解析 表示否定推测要用can’t。房间里一团糟,不可能被打扫过。
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