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精英家教網 > 高中英語 > 題目詳情
They use computers to keep the traffic _______ smoothly. 
A．being runB．runC．to runD．running
D
考查非謂語動詞。句意：他們用電腦保持交通運行流暢�，F在分詞作補足語表示正在進行的伴隨性動作，和被修飾詞是主謂關系。故選D。
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