I have bought 2 ballpens, _______ writes well.
#70187
A
both of which
B
none of which
C
neither of which
D
neither of them
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The hospital opposite our school operates well, _____many patients _____ every day.
#69544
A
where; are being treated
B
which; are treated
C
where; are to be treated
D
that; have been treated
The clock was striking twelve ______ down the street. 
#74557
A
because I walked
B
as I walked
C
since I was walking
D
while I was walking