You should discuss your idea with your classmates because just (

You should discuss your idea with your classmates because just ( ) it to someone else helps you sort it out for yourself.
A、have to explain
B、having to explain
C、have explained
D、having explained
【正确答案】：B
【题目解析】：分词做主语，句子含义是你应该和同学讨论你的想法，因为解释给他们听可以帮助你自己分类。