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【题目】—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】

试题分析:考查情态动词。句意:正在敲门的会是谁呢?有可能是爸爸,我不确定。Can表示猜测,根据后面but I’m not sure 可知不确定,用may be可能是,故选B项。

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