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--Look! The man welcoming us at the school gate be our headmaster． --No,it be him.He is having a mee...
题目内容：
--Look! The man welcoming us at the school gate be our headmaster．
--No,it be him.He is having a meeting in the office now．
A. must; can’t B. must; mustn’t C. can’t; mustn’t D. mustn’t; can
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