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— Look! The man at the gate ________ be our headmaster．He is always standing there in the morning． —...
题目内容：
— Look! The man at the gate ________ be our headmaster．He is always standing there in the morning．
— No, it ________ be him．He is holding a meeting in the office now．
A. must; can't
B. must; mustn't
C. can't; can't
D. can't; mustn't
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