-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 题目和参考答案——青夏教育精英家教网—

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—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

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