请问这道虚拟语气的英语选择题怎么做?
问题描述：
请问这道虚拟语气的英语选择题怎么做?
Had I known about this computer program,a huge amount of time and energy_____.
A.would have been saved B.had been savedC.will be savedD.was saved
请说一下理由?
答
Had I known about this computer program,a huge amount of time and energy_____.A.would have been saved B.had been saved C.will be saved D.was saved请说一下理由?答：A译：要是我当时了解这个计算机程序的话...