I have bought 2 ballpens, writes well.
A. both of which
B. none of which
C. neither of which
D. neither of them
网友回答
A. both of which
B. none of which
(答案→)C. neither of which
D. neither of them
解析：不定代词辨析。Both两个都；none多个中都不；neither两个都不；句意：我买了两支圆珠笔，其中哪一个书写都不好。在非限定性定语从句中指代物时只能用which做引导词，故选C。