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10.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 [考查虚拟语气。句意: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。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A项。]