something I looked forward to doing as I was able to learn from as well as help others.句子结构

题目

something I looked forward to doing as I was able to learn from as well as help others.句子结构

答案

这是我一直盼望去做的事情,因为我不但可以从中学到知识,而且还可以帮助别人.
前面缺少主语和谓语（省略了?）,加上It was以后就全了.
It (主语） was (系动词）something (表语）I looked forward to doing （定语从句）as...（原因状语从句）