-Look!Themanatthegate           beourteacher.Heisalways...

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; couldn't

【回答】

A

知识点：情态动词

题型：选择题