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【题目】Don’t make any noise. I ______ my homework now.

A. am doingB. is doingC. doesD. do

【答案】A

【解析】

句意:不要制造噪音,我正在做作业。A. am doing正在做,现在进行时,主语为IB. is doing正在做,现在进行时,主语为第三人称单数;C. does做,一般现在时第三人称单数;D. do做,一般现在时。根据now可知,用现在进行时,主语为I,故选A

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