题目内容

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电脑使交通运转顺畅。keep ＋宾语＋宾补，此处traffic 与run之间为主谓关系，故用现在分词作宾补。]
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