They use computers to keep the traffic _______ smoothly. 
A．being runB．runC．to runD．running
D
考查非謂語(yǔ)動(dòng)詞。句意：他們用電腦保持交通運(yùn)行流暢�，F(xiàn)在分詞作補(bǔ)足語(yǔ)表示正在進(jìn)行的伴隨性動(dòng)作，和被修飾詞是主謂關(guān)系。故選D。
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