题目内容

--Is the man standing outside the teacher’s office Mr. Zhou?
--No, it ______ be him. He has gone to Hong Kong for an academic conference.
A．mustn’tB．can’tC．needn’tD．couldn’t
B
根据句意可知他去了香港，所以在教师办公室外站着的那个人不可能是他，can’t表示不可能的意思，故本题选B。
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