◎ 题干
—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
◎ 答案
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◎ 解析
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◎ 知识点
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