摘要: A 本题考察定语从句, 该句是非限制性定语从句.先行词为1999 to 2003 是指一段时间.使用介词during. 从句等于During that time, he studied very hard and was made Chairman of the Students’ Union. which time 代替1999 to 2003.关系代词which限定名词time, 而不是做定语.因此C项是错误的.

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