（2010年浙江卷）
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
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。
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。