问题
选择题
31. The room is in a terrible mess; it _______ cleaned.
A．can’t have been
B．shouldn’t have been
C．mustn’t have been
D．wouldn’t have been
答案
答案：A
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31. The room is in a terrible mess; it _______ cleaned.
A．can’t have been
B．shouldn’t have been
C．mustn’t have been
D．wouldn’t have been
答案：A