◎ 题干
The girl had hardly rung the bell _____ the  door was opened suddenly, and her friend rushed
out to  greet her.  
[     ]
A. before          
B. until        
C. as        
D. since
◎ 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“The girl had hardly rung the bell _____ thedoor was opened suddenly, and her friend rushedout togreet her. [ ]A. before B. until C. as D. since…”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。