--Look!Themanatthegate

问题详情：

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

   --No, it _____ be him. He is holding a meeting in the office now.

A. must, can’t     B. must, mustn’t     C. can’t, can’t     D. can’t, mustn’t

【回答】

A

知识点：情态动词

题型：选择题