—Look！Themanatthegate

问题详情：

—Look！The man at the gate ________ be our teacher. 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；can't

【回答】

A

知识点：情态动词

题型：选择题