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
答案： A
考点：本题考查虚拟语气。
解析：根据句子的倒装特征判断此处是省略了if的虚拟语气，原形是：If I had known about
this computer program, a huge amount of time and energy .故选择A。句意为：如果我
早知道这个电脑程序，就可以节省大量的时间和精力了。
-family:"Times New Roman"'>couldn’t/ shouldn't/ wouldn't have done.