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--- Look! The man at the school gate ________ be our headmaster. --- No, it ________ be him. He is h...
题目内容：
--- Look! The man at the school gate ________ be our headmaster.
--- No, it ________ be him. He is holding a meeting in the office now.
A.must; mustn’t B.must; can’t C.can; needn’t
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