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

C．may; must

D．need; should

答案：A
解析：

问句表可能性的用can，答句无根据的推测用may。

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