I do enjoy my present job as an engineer.

问题描述:

I do enjoy my present job as an engineer.
—Well,I would also be an engineer if I my major when I was at college.
A.could have changed B.should change C.hadn't changed D.wereto change

选C.

考察:虚拟语气的用法.

从时间状语when i was at college 来看,是过去的时间,对过去的虚拟用had+过去分词的形式

翻译:如果我大学期间没换专业的话,我也会是一名工程师了.