◎ 题干
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
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“ 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.unl…”主要考查了你对  【并列连词】【从属连词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。