题目内容
—Who______ it be that is knocking at the door?
—It ______ be Father, but I’m not sure.
A. can; must B. can; may C. must; can D. may; must
B
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--Listen! Someone is singing in the next room.Who it be? Is it Wei Fang?
--No.It be her.She is at school now.
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B.must; mustn't |
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