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 speed up在此表示“(使)加快速度”。句意为:为了加快交通流量的速度,他们正在给大桥加宽。其余三项:A项表示“推迟”,C项表示“打开(开关)”,D项表示“算出”,均与句意不符。本题选B。
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