◎ 题干
Mark was a student at this university from 1999 to  2003,______he studied very hard and was made    
Chairman of the Students' Union.    
[     ]
A. during which time        
B. for which time    
C. during whose time        
D. by that time
◎ 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“Mark was a student at this university from 1999 to2003,______he studied very hard and was madeChairman of the Students' Union. [ ]A. during which time B. for…”主要考查了你对  【关系代词】【介词和介词短语】【非限制性定语从句】  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。