i did (that/what) i could (help/to help) others.这两个怎么选/为什么?

问题描述:

i did (that/what) i could (help/to help) others.这两个怎么选/为什么?
that为什么不能做宾语
to help做谁的宾补

I did what i could to help others.
that不能在这儿用.I did what I could,and that I have helped you,我尽力了,而且我也帮到你了,这么用可以.