---Look!Themanatthegate      beourheadmaster.Heisalways...

问题详情：

---Look ! The man at the gate       be our headmaster 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 , can't         D. can , mustn't

【回答】

A

知识点：情态动词

题型：选择题