It was several years ________ I realized ________ David had lied to me.

A．when; that

B．that; when

C．before; that

D．until; why

经资源评估和调查，根据目标提出备选方案，应考虑（）

A.可预测的投入与效益之比

B.选定方案

C.比较方案

D.执行方案

E.编制方案