If I _______ long enough to have a job, I _______ choose to be a doctor, helping these AIDS patients.A.were to live; wouldB.had lived; wouldC.should live; would haveD.lived; would have
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A解析这是一个if引导的虚拟条件句，表示与将来的事实相反，句意为“要是我能活到找工作的年龄，我将选择成为一个医生以帮助这些艾滋病人”。这里的语境是说话者知道自己身患绝症，不可能活很久，与将来事实可能相反。此时，从句中用“were to+动词原形”/动词过去式/“should+动词原形”；主句中使用“would/might/could/should+动词原形”。