问题补充：
What prevented your plan?
A. from being carried out
B. from carrying out
C. to carry out
D. to be carried out
答案：
(答案→)A. from being carried out
B. from carrying out
C. to carry out
D. to be carried out
解析：这题考查prevent sb from doing“阻止某人做”因为your plan和carry out之间是被动的关系，选A。句意是：什么阻止你的计划被实施。
