With the change of red lights, there are long queues of vehicles that wait while a few people who walk across the sidewalk.

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问题 With the change of red lights, there are long queues of vehicles that wait while a few people who walk across the sidewalk.

选项 A、wait; walk
B、waiting; walking
C、waiting; walk
D、wait; walking

答案C

解析 第一处画线部分修饰前面的名词,相当于一个定语从句,又是表示主动和正在进行,因此应用动词现在分词形式,所以选waiting;while引导表示对比关系的从句,所以应是a few people walk across the sidewalk(一些人穿过了人行道),所以答案为C。
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