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—Look! The man at the gate ________ be our headmaster. —No, it _________ be him. He is holding a mee...
题目内容：
—Look! The man at the gate ________ be our headmaster.
—No, it _________ be him. He is holding a meeting in the office.
A. must, can’t B. must, mustn’t C. can, can’t D. can, mustn’t
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