题目内容
14．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 |
分析 直到她冲过终点线，大家才会相信一个92岁的老人能跑完马拉松．每个年龄段的人都可以挑战他们自己．
解答 答案：C if意思是"如果"引导条件状语从句；since意思是"自从…以来"引导时间状语从句；until意思是"直到…为止"引导时间状语从句．根据"she passed the finishing line"以及"believes a 92-year-old could run a marathon"可知直到她冲过终点线，大家才相信92岁的老人能跑完马拉松，所以要用until来引导时间状语从句，故选C．
点评 首先要掌握if，since，until这三个词的意思以及用法，然后结合具体的题意，就可以做出正确选择．
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