Question

Helping others is a habit ,( )you can learn even at an early age. A. what B.one 答案说选B.说用wha

答案说用what句子成分就不全了，为什么啊？ 帮忙分析一下，好了就加分。快来人啊

Answer 1

用what 就不用habit 了, one 表示one habbit,
语法上一个字what = something that /which ( 两个)
对比, helping others is what you can learn even at an early age
不知说到点子上没.

Answer 2

one是指habit, 后面的you can learn ...是one 定语，合起来是habit 的同位语。

Answer 3

这是一个定语从句，one做learn的宾语。