题目内容
Nobody believed a 92-year-old man could run a marathon_______he passed the finishing line. People of all ages can challenge themselves.
| A．if | B．since | C．until | D．unless |
C
解析试题分析：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。
考点：考查状语从句连接词
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