题目内容：

I have bought two ballpens,＿＿writes well.
选项：A.none of them
B.neither of them
C.neither of which
D.none of which
为什么是选择 C 而不是选择B

优质解答

选择 C 而不是选择B的原因是两个独立句子之间必须要有连接词,
如果要选B,句子应该改为：I have bought two ballpens,but＿＿writes well
这里用which是引导非限制性定语从句修饰前面的ball pen,应为有介词of,所以只能用which.