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【题目】—May I use your computer?

—Sorryyou can't.I __________ it now.

A.useB.am using

C.usingD.is using

【答案】B

【解析】

句意:我可以使用你的电脑吗?对不起,你不能。现在我正在使用它。

考查现在进行时。use使用;am using正在使用,用于主语是I的现在进行时中;using使用,useing形式;is using正在使用,用于主语是第三人称单数的现在进行时中。根据关键词“now”及提供的选项,可推测“我”正在使用电脑,属于现在进行时,其结构为“be+Ving”形式,根据句子的主语是I,故选B

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