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

A. being run B. run

C. to run D. running

【答案】D

【解析】

試題分析：這兒構(gòu)成“keep+賓語+doing”固定用法�，F(xiàn)在分詞作動詞keep的賓語補足語。traffic與run之間是主動關(guān)系，所以用現(xiàn)在分詞。

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