They are broadening the bridge to the flow of traffic.A. put offB. speed upC. turn onD. wo

问题补充：

They are broadening the bridge to the flow of traffic.

A. put off

B. speed up

C. turn on

D. work out

答案：

A. put off

(答案→)B. speed up

C. turn on

D. work out

解析：考察动词的辨析。句意为：他们正在拓宽桥面来加快交通流量。put off推迟 ；turn on打开； work out解决；算出；实现。