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They are broadening the bridge to       the flow of traffic.

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

B

解析試題分析：句意：他們拓寬了大橋來加速交通的流暢。put off延期 speed up加速 turn on打開 work out解決，選B。
考點：考查詞組辨析

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