问题
选择题
In some cities the traffic police use computers to keep the traffic________smoothly.
A．being run
B．run
C．to run
D．running
答案
答案：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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