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

試題分析：考查狀語從句連接詞。句意：沒有人相信一個92歲的老人能參加馬拉松，直到他跑到了終點線。每個年齡段的人都可以挑戰(zhàn)一下自己。not...until...直到......才......。If如果，表條件；since自從；unless除非。故選C。
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