The room is in a terrible mess; it        have been cleaned.
A．mustn’tB． can’tC．shouldn’tD．wouldn’t
B
考查情態(tài)動詞用法。沒有mustn’t have done 的結(jié)構(gòu)，故排除A。shouldn’t have done 本不應(yīng)該做某事，實際上卻做了；can’t/couldn’t have done不可能做了某事，表示對過去肯定的推測；句意：房間亂七八糟。不可能打掃了。故B正確。
點評：情態(tài)動詞+have done ,表示對過去的虛擬或推測。記住這些結(jié)構(gòu)的意思：shouldn’t have done 本不應(yīng)該做某事，實際上卻做了；needn’t have done本不需要做某事，實際上卻做了。can’t/couldn’ t have done不可能做了某事，
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