【题目】They use computers to keep the traffic _________ smoothly.
A. being run B. run C. to run D. running
在线课程【答案】D
【解析】本题考查keep短语的应用及非谓语动词的用法：keep +宾语+宾语补足语。此处，traffic与 run之间存在主动关系，故用doing形 式表示“在运转”的状态。句意：他们用电脑使交通运转顺畅。
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