题目内容

(   ) 5. [2015 • 滨州]—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

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