-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—

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

答案：B

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