I was expected to continue ______ futher before ______ a job as an engineer.

问题描述:

I was expected to continue ______ futher before ______ a job as an engineer.
A.studying,finding B.to study,to find C.with studying,find D.studying,I find
请说明一下理由

A
continue doing sth表示继续做某事
before是介词后可跟名词,代词,动名词