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【题目】— Look! The man at the gate ________ be our headmaster.He is always standing there in the morning.

— No, it ________ be him.He is holding a meeting in the office now.

A. must; can't

B. must; mustn't

C. can't; can't

D. can't; mustn't

【答案】A

【解析】句意:——看!门口的那个人一定是我们的校长,他总是在早上站在那儿。——不,不可能是他。他现在正在办公室开会。考查情态动词辨析题。must一定,表肯定判断;mustn't,一定不要,表禁止;can't不可能,表否定判断。根据句意语境,可知选A。

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