【題目】—May I use your computer?

—Sorry,you can't.I __________ it now.

A.useB.am using

C.usingD.is using

【答案】B

【解析】

句意:我可以使用你的電腦嗎?對不起,你不能。現(xiàn)在我正在使用它。

考查現(xiàn)在進行時。use使用;am using正在使用,用于主語是I的現(xiàn)在進行時中;using使用,useing形式;is using正在使用,用于主語是第三人稱單數(shù)的現(xiàn)在進行時中。根據(jù)關(guān)鍵詞“now”及提供的選項,可推測“我”正在使用電腦,屬于現(xiàn)在進行時,其結(jié)構(gòu)為“be+Ving”形式,根據(jù)句子的主語是I,故選B。

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