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    精英家教网 > 高中英语 > 题目详情

    It is impossible for anyone _____ these photographs before, because Mr Newman had them developed today.


    1. A.
      having seen
    2. B.
      to have seen
    3. C.
      to see
    4. D.
      seeing
    B
    it是形式主语，不定式作真正的主语；由before可知要用不定式的完成式。
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