you haven't done this before,----------------.
A: have you ?
B: did you ?
C: haven't you?
D: didn't you?
E: hasn't you ?
A: have you ?
B: did you ?
C: haven't you?
D: didn't you?
E: hasn't you ?
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A, потому что в основном предложении отрицание, значит в хвостике должно быль положительное "предложение"