They use computers to keep the traffic _______ smoothly. A. being run B. ru

They use computers to keep the traffic _______ smoothly.

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

答案

解析:

考查非谓语动词Ving，这儿构成(keep sth. doing。)。

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They use computers to keep the traffic _______ smoothly. A. being run B. ru

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