The room is in a terrible dirty surroundings; it ______ cleaned.

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问题 The room is in a terrible dirty surroundings; 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

解析本题测试情态动词+完成式。句子前半部分“房间乱极了”是前提，后半部分应该是对这种情况做出一种猜测性判断，且带否定意味，应用否定形式can’t have been。shouldn’t have been意思为真不应该打扫，而实际上已经打扫过了，跟句意不符。

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