◎ 题干
I tried to call you _____ I hear from him, but you were not in.
[     ]
A. since          
B. while            
C. until          
D. as soon as
◎ 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 tried to call you _____ I hear from him, but you were not in.[ ]A. since B. whileC. until D. as soon as…”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。