问题
选择题
They use computers to keep the traffic _______ smoothly.
A．being run
B．run
C．to run
D．running
答案
答案：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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They use computers to keep the traffic _______ smoothly.
A．being run
B．run
C．to run
D．running
答案：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。