—Look! The man at the gate ______ be our headmaster. He is always standing there every morning.
—No, it ______be him. He is holding a meeting in the office now.

A．must, can’tB．must, mustn’t
C．can’t, can’tD．can’t, mustn’t

A

解析試題分析：must的含義是必須一定，其否定形式mustn’t表示禁止的含義。Can’t含義是，不能，可能不。句意：看，門口的那個(gè)男人一定是我們的校長。每天早晨他總是站在那兒�！�，不可能是他。他現(xiàn)在正在辦公室主持會(huì)議。結(jié)合語境可知選A。
考點(diǎn)：情態(tài)動(dòng)詞辨析
點(diǎn)評：情態(tài)動(dòng)詞的考查是初中英語考查的重點(diǎn)，平時(shí)學(xué)習(xí)中一定要熟記這些詞的基本詞義及用法上的不同，注意其用法及在句子中表達(dá)語氣的不同。考試中結(jié)合語境選擇合適答案。

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