题干

——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   

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答案(点此获取答案解析)

A