Great changes have taken place since then in the factory _______we are working. 
#73799
A
where
B
that
C
which
D
there
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I have bought two ballpens, _______ writes well. 
#73768
A
none of them
B
neither of them
C
neither of which
D
none of which
. China has hundreds of islands, _____ is Taiwan.
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A
the largest of which
B
of which largest
C
which the largest
D
in which the largest