◎ 题干
I warned him of the slippery road, but he fell on fours ________ I finished my words.
[     ]
A. as  
B. before
C. until  
D. since
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“I warned him of the slippery road, but he fell on fours ________ I finished my words.[ ]A. asB. beforeC. untilD. since…”主要考查了你对  【从属连词】【状语从句】  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。