问题描述：
I have bought two pens ,__________ write well.A.none of which;B.neither of which
I have bought two pens ,__________ write well.
A.none of which; B.neither of which
C.both of which; D.all of which
选C
I have bought two pens ,__________ write well.
A.none of which; B.neither of which
C.both of which; D.all of which
选C
问题解答：
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