Question

Mark was a student at this university from 1999 to 2003, ________ he studied very hard and was made Chairman of the Students' Union.

1. A.
   during which time
2. B.
   for which time
3. C.
   during whose time
4. D.
   by that time

Answer 1

A
解析：
解析：from 1999 to 2003是表示一个时间段，故在用介词+关系代词引导定语从句时，介词需用during表示“在……期间”，在这一结构中，所用的关系代词只有两个；
指人时用whom，指物时用which，故不能选C．命题立意：考查非限制性定语从句，此题难度较大，考生需牢牢掌握基础知识，才能顺利选题．