问题
选择题
Nobody believes a 92-year-old could run a marathon she passed the finishing line. People of all ages can challenge themselves.
A. if B. since C. until
答案
答案：C
本题考查连词的用法。本题考查固定短语not…until直到……才……句式。句意：直到她通过终点线，没有人相信一个92岁的老人能够跑马拉松。各种年龄的人都可以挑战自己。