【題目】Keep quiet! Jim and Tim their homework.

A.is doingB.are doingC.doesD.do

【答案】B

【解析】

句意：保持安靜！吉姆和蒂姆正在做作業(yè)。

考查時(shí)態(tài)。is doing現(xiàn)在進(jìn)行時(shí)態(tài)的第三人稱單數(shù)形式；are doing現(xiàn)在進(jìn)行時(shí)態(tài)形式；does一般現(xiàn)在時(shí)態(tài)的第三人稱單數(shù)形式；do動(dòng)詞原形。根據(jù)前句Keep quiet!可知，要用現(xiàn)在進(jìn)行時(shí)態(tài)，主語(yǔ)是Jim and Tim，故填are doing，故選B。

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