In some cities the traffic police use computers to keep the traffic________smoothly.
A．being runB．runC．to runD．running
D
答案　D　[句意：一些大城市的交警用電腦使交通運(yùn)轉(zhuǎn)順暢。keep ＋賓語＋賓補(bǔ)，此處traffic 與run之間為主謂關(guān)系，故用現(xiàn)在分詞作賓補(bǔ)。]
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