题目内容

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 timeB.for which timeC.during whose timeD.by that time
A
考查介词与关系词引导的定语从句。先行词是1999 to 2003, 因此应选择A,在这段期间。
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