◎ 题干
Many students didn't realize the importance of study _______ they left school.
[    ]
A. when      
B. until      
C. after      
D. unless
◎ 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“Many students didn't realize the importance of study _______ they left school. []A. whenB. until C. after D. unless…”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。