【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。現(xiàn)在分詞作動(dòng)詞keep的賓語補(bǔ)足語。trafficrun之間是主動(dòng)關(guān)系,所以用現(xiàn)在分詞。

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