Today the police can watch cars ______ on roads by radar.

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问题 Today the police can watch cars ______ on roads by radar.

选项 A、run
B、to run
C、running
D、to be run

答案C

解析 本题考查的是watch一词的用法,即watch sb. /sth. do/doing, do表示瞬间动作;doing则表示正在进行或当前状态,这里侧重正在进行,因而选C。
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