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Mark was a student at this university from 1999 to 2003,____

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Mark was a student at this university from 1999 to 2003,______ he studied very hard and was made C
for which time
不是也表示一段时间内吗
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 whose time B.during which time C.for which time D.by that time
for which time
不是也表示一段时间内为什么不能用?
Mark was a student at this university from 1999 to 2003,____
这里强调一个他学习的那段时间中他做了些什么,所以用during which用来指代1999~2003 这里不是考察是否能表示一段时间的问题 强调的是在那段时间中他干什么了,for是代表一段时间但没有“在.时间段中”这一意思