. Had I known about this computer program a huge amount of time and energy .A. would hav

问题补充：

. 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：

(答案→)A. would have been saved

B. had been saved

C. will be saved

D. was saved

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