I have three pens.One is red,_____ two are black.

问题描述:

I have three pens.One is red,_____ two are black.
A another B other C the other D the others
选项应是什么?

C TWO 特指剩下的两支钢笔.所以选C
other 后加名词.others 已经包括那个名词在里面了.
因为是特指剩下的两支笔 所以前面加定冠词 THE