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    精英家教网 > 高中英语 > 题目详情
    　　　　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
    选C。考查倒装句和省略。含有should, had或were的虚拟条件句, 可省略if, 必须将should, had或were提到主语前。此处表示与过去事实相反的假设, 故选C。
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