-Look!Themanatthegate           beourteacher.Heisalways...

問題詳情：

-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

知識點：情態動詞

題型：選擇題