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They are broadening the bridge to       the flow of traffic.

A.put offB.speed upC.turn onD.work out

B

解析试题分析:句意:他们拓宽了大桥来加速交通的流畅。put off延期 speed up加速 turn on打开 work out解决,选B。
考点:考查词组辨析

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