Question

Nobody believes a 92-year-old could run a marathon______she passed the finishing line. People of all ages can challenge themselves.

1. A.
   if
2. B.
   since
3. C.
   until

Answer 1

C
本題考查連詞的用法。本題考查固定短語not…until直到……才……句式。句意：直到她通過終點線，沒有人相信一個92歲的老人能夠跑馬拉松。各種年齡的人都可以挑戰(zhàn)自己。