The first snow fell in December in our province last year,         was uncommon.
#78720
A
it
B
which
C
that
D
what
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I have bought two ball pens, _____ writes well.
#78692
A
none of them
B
neither of them
C
none of which
D
neither of which
At present, we are studying a total of nine subjects, ________ I think is physics.
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A
of them the most difficult
B
and the most difficult of which
C
the most difficult of them
D
the most difficult of which