【題目】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。他已經(jīng)住院很長時間。can be 可能是， can’t be 不可能是，may be 也許是， must be一定是。根據(jù)He has been in hospital for long.可知他住院很長時間，因此他不可能在工作，這是有把握的推測，故用情態(tài)動詞can’t。故選B。

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