◎ 题干
---Look. The man at the gate _____ be our headmaster. He is always standing there every morning.
---No. it ____ be him. He is having a meeting in the office now.
A.must; can’tB.must; mustn’t
C.can’t; can’tD.can’t; mustn’t
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◎ 解析
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◎ 知识点
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