913.Mark was a student at this university from 1999 to 2003,________ he studied very hard and was made chairman of the Student’s Union.
A.during which time
B.from which time
C.during whose time
D.by that time
914.The schools themselves admit that not all children will be successful in the jobs ______ they are being trained.
A.in that
B.for that
C.in which
D.for which