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

旅行社拒不承担或无力承担对旅游者的赔偿责任时，旅游行政管理部门应当从该旅行社的质量保证金中划拨赔偿费用。