【題目】—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

【解析】

試題分析：句意：--可能是誰(shuí)在敲門(mén)呢？--或許是爸爸，但是我不確定。Can表否定或疑問(wèn)猜測(cè)。May表可能性小的猜測(cè)。故選B。

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