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—Look! The man at the gate________be our headmaster. He stands there every morning —No, it________be...
题目内容：
—Look! The man at the gate________be our headmaster. He stands there every morning
—No, it________be him. He is holding a meeting in the office
A.must; can’t B.must; mustn’t C.can’t; can’t D.can’t; mustn’t
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