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—Look! The man at the gate _____be our teacher. He is always standing there every morning. —No, it _...
题目内容：
—Look! The man at the gate _____be our teacher. He is always standing there every morning.
—No, it _______ be him. He is having a meeting in the office now.
A. must; can’t B. must; mustn’t C. can’t; can’t
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