◎ 题干
Though the problems were all very hard, Kate kept on working on them       she finally solved all of them.  
[     ]
A. before
B. until
C. when
D. after
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“Though the problems were all very hard,Kate kept on working on them she finally solved all of them.[ ]A. beforeB. until C. whenD. after …”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。