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英语
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MR.Smith with several students___experiments in the lab now.a.do b.did c.are doing d.is doing
人气：175 ℃ 时间：2020-05-13 11:07:42
解答
D.is doing
因为这句话的主语是Mr.Smith,是单数形式,而with several students是它的伴随状语,所以这句话的主语是单数形式,谓语动词也要用单数形式.那为啥 不选 ab呢因为后面的时间状语是now，是现在进行时，所以不能选A（一般现在时）和B（一般过去时）
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