-Who it be that is knocking at the door?-It be father, but I’m not sure.A．can; mayB．may; canC．may; mustD．need; should 题目和参考答案——青夏教育精英家教网—

题目内容

—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

解析

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