问题补充：
They are broading 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：句意：今天早晨Mary逃脱了因迟到而应遭受的惩罚。escape from doing sth逃脱，from可以省略，当句子的escape动作执行者是该动词ing形式的动作承受者时用v-ing的被动式：being + 过去分词。故选C。
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