问题
Look! The man at the gate _______be our headmaster. He is always standing there every 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;
B:must; mustn’t
C:can’t; can’t
D:can’t; mustn’t;
正确答案是：
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