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【题目】He ______at work. He has been in hospital for long.

A. can be B. can’t be C. may be D. must be

【答案】B

【解析】

句意:他不可能在工作。他已经住院很长时间。can be 可能是, can’t be 不可能是,may be 也许是, must be一定是。根据He has been in hospital for long.可知他住院很长时间,因此他不可能在工作,这是有把握的推测,故用情态动词can’t。故选B。

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