【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：考查非謂語動詞辨析。keep sb./sth. doing sth.表示“讓……一直做……”。句意：他們用電腦讓交通保持順暢。選D項。

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