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 saved C.will be saved D.was saved请说一下理由?
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![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 saved C.will be saved D.was saved请说一下理由?](/uploads/image/z/5467411-19-1.jpg?t=%E8%AF%B7%E9%97%AE%E8%BF%99%E9%81%93%E8%99%9A%E6%8B%9F%E8%AF%AD%E6%B0%94%E7%9A%84%E8%8B%B1%E8%AF%AD%E9%80%89%E6%8B%A9%E9%A2%98%E6%80%8E%E4%B9%88%E5%81%9A%3FHad+I+known+about+this+computer+program%2Ca+huge+amount+of+time+and+energy_____.+A.would+have+been+saved+++++B.had+been+saved++++++C.will+be+saved++++++D.was+saved%E8%AF%B7%E8%AF%B4%E4%B8%80%E4%B8%8B%E7%90%86%E7%94%B1%3F)
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