【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】本題考查keep短語的應用及非謂語動詞的用法：keep +賓語+賓語補足語。此處，traffic與 run之間存在主動關系，故用doing形 式表示“在運轉”的狀態(tài)。句意：他們用電腦使交通運轉順暢。

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