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Nobody believed a 92-year-old man could run a marathon_______he passed the finishing line. People of all ages can challenge themselves.
A.ifB.sinceC.untilD.unless
C

试题分析:考查状语从句连接词。句意:没有人相信一个92岁的老人能参加马拉松,直到他跑到了终点线。每个年龄段的人都可以挑战一下自己。not...until...直到......才......。If如果,表条件;since自从;unless除非。故选C。
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