--Look!Themanatthegate

問題詳情：

-- 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

知識點：情態動詞

題型：選擇題