I hope (that) the little (that) I have been able to do has b

I hope that……宾语从句,that可以省略,我希望……
the little (that) I have been able to do has been of some one.
定语从句,I have been able to do （the little）,所以that就代指the little
定语从句缺成分用that,which或省略都可以