【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】试题分析：考查非谓语动词辨析。keep sb./sth. doing sth表示让……一直做……。句意：他们用电脑让交通流动顺畅。根据句意可知选D项。
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