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
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提到主語前。此處表示與過去事實相反的假設(shè), 故選C。
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