His shoes are muddy. He        be working in an office all day.
A．mustn ’tB．can’tC．needn’tD．maybe
B
本題考查情態(tài)動(dòng)詞。根據(jù)句意：他的鞋泥濘，他不可能成天在辦公室工作。故用情態(tài)動(dòng)詞can’t。
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