◎ 题干
I'm sorry you've been waiting so long, but it'll still be some time _____ Smith gets back.

A. before
B. since
C. till
D. after
◎ 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“I'm sorry you've been waiting so long, but it'll still be some time _____ Smith gets back. [ ]A. before B. sinceC. till D. after …”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。