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【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(yīng)用及非謂語動(dòng)詞的用法:keep +賓語+賓語補(bǔ)足語。此處,traffic run之間存在主動(dòng)關(guān)系,故用doing 式表示“在運(yùn)轉(zhuǎn)”的狀態(tài)。句意:他們用電腦使交通運(yùn)轉(zhuǎn)順暢。

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