about this computer program, a huge amount of time and energy　　　　.

A. Should I know; be saved

B. If I had known; can be saved

C. Had I known; would have been saved

D. Did I know; was saved

 

C

【解析】選C�？疾榈寡b句和省略。含有should, had或were的虛擬條件句, 可省略if, 必須將should, had或were提到主語(yǔ)前。此處表示與過(guò)去事實(shí)相反的假設(shè), 故選C。

 

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