◎ 题干
We have been good friends ________ we joined the same ping-pong team.     
[     ]
A.after  
B. before  
C. since    
D. until
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“We have been good friends ________ we joined the same ping-pong team.[ ]A.after B. before C. since D. until…”主要考查了你对  【从属连词】【状语从句】  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。