I will never forget the day _______ I came to my university and the day ______  I spent in a new city. 
#4966
A
when; which
B
which; when
C
what; that
D
on which; when
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I haven’t seen______ this since I collected stamps.
#4923
A
as old a stamp as
B
so an old stamp as
C
stamp as old as
D
as an old stamp a
--I don't think we have met before.--Yes, once at a party, but we___________.
#4832
A
weren't introduced
B
didn't introduce
C
haven't introduced
D
were not introducing