【題目】— 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！門口的那個人一定是我們的校長，他總是在早上站在那兒。——不，不可能是他。他現(xiàn)在正在辦公室開會�？疾榍閼B(tài)動詞辨析題。must一定，表肯定判斷；mustn't，一定不要，表禁止；can't不可能，表否定判斷。根據(jù)句意語境，可知選A。

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