摘要： If I about this computer program, a huge amount of time and energy would have been saved. A. knew B. know C. have known D. had known
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________ about this computer program, a huge amount of time and energy would have been saved.（ ）
A. Had I known B. If I knew C. If I should know D. Would I know
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If I had 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
查看习题详情和答案>>If I had 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
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