Helping others is a habit ( ) you can learn even a

问题补充：

Helping others is a habit,( ) you can learn even at an early age.答案是one 我理解 能不能用which?

答案：

one that是同位语从句

which看起来能用,感觉好像用了缺成分,问问老师吧

======以下答案可供参考======

供参考答案1:

不能，此处的one若换成which的话，意思代表不全面