问题
选择题
They are broadening the bridge to ________ the flow of traffic.
A.put off
B.speed up
C.turn on
D.work out
答案
答案:B
题目分析:考查动词短语的辨析。句意为:他们正在拓宽桥面来加快交通流量。put off推迟;speed up加速,turn on打开; work out解决;算出;实现。选B。