---Look. The man at the gate _____ be our headmaster. He is always standing there every morning.---N

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---Look. The man at the gate _____ be our headmaster. 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	D．can’t; mustn’t

题型：单选题难度：偏易来源：不详

答案

在英文中，表示猜测可能性最大的用must表示一定的意思，可能性最小的用can’t表示不可能的意思，本题的前句根据校长总是站在门旁，那么在门旁的那个人是校长的可能性为最大，故用must，后句说校长正在开会，那么在门旁的那个人为校长的可能性应该为最小，故用can’t，故选A。

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---Look. The man at the gate _____ be our headmaster. He is always standing there every morning.---N

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