16. —Who____ it be that is knocking at the door? —It ____ be Father, but I’m not sure. A．can; mustB．can; mayC．must; canD．may; must-高中英语-n多题

◎ 题干

16. —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

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◎ 解析

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◎ 知识点

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