If I long enough to have a job I would choose to be a doctor those AIDS patientsA. had l

问题补充：

If I long enough 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

答案：

A. had lived; helping

B. should live; help

(答案→)C. were to live; helping

D. should have lived; help

解析：考查虚拟语气和伴随状语：句意：我要是活得足够长时间可以做个工作，我会选择做一个医生，帮助那些艾滋病人。因为主句是would do表示和将来相反的虚拟语气，从句可以是should do或were to do，第一空排除AD，第二空应该是现在分词做状语，排除BD，选C。