◎ 题干
— Have you seen Mr. Smith?    
— He arrived ______ you were asleep.
[     ]
A. since
B. while
C. before
D. until
◎ 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“— Have you seen Mr. Smith?— He arrived ______ you were asleep. [ ]A. since B. whileC. beforeD. until…”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。