【題目】They use computers to keep the traffic _________ smoothly.

A. being run B. run C. to run D. running

【答案】D

【解析】試題分析：考查非謂語(yǔ)動(dòng)詞辨析。keep sb./sth. doing sth表示讓……一直做……。句意：他們用電腦讓交通流動(dòng)順暢。根據(jù)句意可知選D項(xiàng)。

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