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In some cities the traffic police use computers to keep the traffic________smoothly.
A.being runB.runC.to runD.running
D
答案 D [句意:一些大城市的交警用电脑使交通运转顺畅。keep +宾语+宾补,此处traffic 与run之间为主谓关系,故用现在分词作宾补。]
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