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    精英家教网 > 高中英语 > 题目详情
    They use computers to keep the traffic _______ smoothly. 
    A．being runB．runC．to runD．running
    D
    考查非谓语动词。句意：他们用电脑保持交通运行流畅。现在分词作补足语表示正在进行的伴随性动作，和被修饰词是主谓关系。故选D。
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