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
A

試題分析：句意：如果我了解電腦的話，大量時間和精力都會省下來了。如果省略if，那么把had,should,were提前，由從句的謂語動詞可以看出這是對過去的虛擬，所以主句用would have done，故選A。
點評：本題難度適中。虛擬語氣是高中階段的重要語法項目，需要考生牢記各種情況的虛擬語氣的謂語動詞的形式，并要有分析理解語境的能力。
即學(xué)即練：I wish I ________ there with them last week.
A．would have been　    B．were      C．had been         D．was
解析：C。句意：我希望上周跟他們一起在那兒。
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