They use computers to keep the traffic smoothly. A. being run B. run C. to run D. running 题目和参考答案——青夏教育精英家教网—

题目内容

They use computers to keep the traffic _______ smoothly.

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

解析:

考查非谓语动词Ving，这儿构成(keep sth. doing。)。

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