-Who it be that is knocking at the door? -It be Father, but I’m not sure. A．can; mustB．can; mayC．must; can D．may; must 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; must

B．can; may

C．must; can

D．may; must

解析

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