They use computers to keep the traffic _____ smoothly.A.being runB.runC.to runD.running-高三英语

题目简介

They use computers to keep the traffic _____ smoothly.A.being runB.runC.to runD.running-高三英语

题目详情

They use computers to keep the traffic _____ smoothly. 
A.being runB.runC.to runD.running
题型:单选题难度:中档来源:不详

答案

D
考查非谓语动词,这儿构成(keep sth. doing)。

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