单选题
2.
The bedroom 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
【正确答案】
A
【答案解析】
can或could表示对已经发生的情况进行否定的推测，其结构为：“can’t(couldn’t)+have+过去分词”。
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