◎ 题干
I felt disappointed and was about to leave       something came to my attention.  
[     ]
A. before        
B. when        
C. as          
D. while
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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 felt disappointed and was about to leave something came to my attention. [ ]A. before B. whenC. as D. while…”主要考查了你对  【连接副词】【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。