问题
单项选择题
If being carried out successfully, the plan will completely change the traffic conditions in the city.
A. carried
B. is carried
C. having been carried
D. to carry
答案
参考答案：A
解析： 结构应用
本句考察的是省略的用法：当状语从句的主语和主句的主语相同时，状语从句可以用分词短语作状语。本句完整的句子应为“if it is carried out successfully…”，变成省略句时，直接用“if+过去分词”，因此A为答案。