If I( )long enoiugh to have a job,I would choose to be a doc
If I( )long enoiugh to have a job,I would choose to be a doctor,( )those AIDS patients
A.had lived;helping B.should live;help C.were to live;helping D.should have lived;help
该题正确答案应选C,说明其他几项为什么不对,