They are broadening the bridge to______the flow of traffic.

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问题 They are broadening the bridge to______the flow of traffic.

选项 A、put off
B、speed up
C、turn on
D、work out

答案B

解析本题考查动词短语。put off“推迟，延期”；speed up“(使)加快速度”；turn on“打开”(开关、电器等)；work out“计算出”，“解决，制定”，“以某种方式发展”。根据句意只有B项符合语境。

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