问题补充：
Mark was a student at this university from to ，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：
(答案→)A. during which time
B. for which time
C. during whose time
D. by that time
解析：考察定语从句。本题定语从句的先行词是from to ，在定语从句中使用which time指代前面的先行词，注意that不能放在介词的后面，排除D项。C项指的whose并不是time的定语。用介词dring表示“在…期间”；句意：从到，Mark在这所大学里读书，在此期间，他学习非常努力，被选为学生会的主席。故A正确。
