I have bought two ballpens,_______ writes well.

问题描述:

I have bought two ballpens,_______ writes well.
A.none of them B.neither of them C.neither of which D.none of which

选C
首先排除A.D,因为none适用于三者或三者以上的否定.
接下来看them和which的区别,空格前有逗号,而them在这要有连词才能够用,比如把逗号改成while答案就选B.