-Who it be that is knocking at the door? -It be father, but I’m not sure. A. can; may B. may; can C. may; must D. need; should 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; may B. may; can C. may; must D. need; should

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