◎ 题干
We'd better set off now, or it will be dark _____ we know it.

A. until
B. after
C. when
D. before
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“We'd better set off now, or it will be dark _____we know it. [ ]A. until B. after C. when D. before …”主要考查了你对  【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。