问题
选择题
They are broadening the bridge to ________ the flow of traffic.
A.put off
B.turn on
C.speed up
D.work out
答案
答案:C
题目分析:考查动词短语:A. put off推迟,B. turn on打开,C. speed up加速,D. work out制定出,句意:他们正在加宽这座桥,来加速交通的流量。选C。