MR.Smith with several students___experiments in the lab now.a.do b.did c.are doing d.is doing

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MR.Smith with several students___experiments in the lab now.a.do b.did c.are doing d.is doing
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MR.Smith with several students___experiments in the lab now.a.do b.did c.are doing d.is doing
MR.Smith with several students___experiments in the lab now.a.do b.did c.are doing d.is doing

MR.Smith with several students___experiments in the lab now.a.do b.did c.are doing d.is doing
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.