The man showed us so heavy a stone _______ no man can lift.
#72420
A
that
B
as
C
which
D
and
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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.
#70659
A
the largest of which
B
of which largest
C
which the largest
D
in which the largest