Mark was a student at this university from 1999 to 2003, ____ ,  he studied very hard and was made Chairman of the Students' Union. 
#4898
A
during which time
B
for which time
C
during whose time
D
by that time
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Edward, you play so well. But I ______ you played the piano. 
#5038
A
didn’t know
B
hadn’t known
C
don’t know
D
haven’t known
The young man spent as much time as he __ over his lessons.
#4555
A
went
B
could go
C
could going
D
could to go