The room is in such a terrible mess. It______cleaned as the landlady said.
A．mustn't be
B．mustn't have been
C．can't be
D．can't have been

A.
A．mustn't
B.mustn't
C.can't
D.can't

【参考答案】

D
本题考查情态动词，前一句表明，房间乱作一团，肯定没有打扫，因此空处应该填入表示'不可能像房东说的打扫过'的意......

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