【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】句意：他們用電腦使交通運轉(zhuǎn)順暢。keep＋賓語＋賓補，此處traffic與run之間為主謂關(guān)系，故用現(xiàn)在分詞作賓補。

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