问题
选择题
--- Hey, Tom．I think I am quite familiar with these photographs．
--- It is impossible for anyone_________ them before, because Mr．Newman had them developed today．
A．having seen
B．to have seen
C．to see
D．seeing
答案
答案：B
考查非谓语动词。本题考查不定式的时态，根据句中时间状语before，故用其完成式，选B。
