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是形式主語(yǔ)，不定式作真正的主語(yǔ)；由before可知要用不定式的完成式。
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