已知a、b、c是△ABC的三边，且满足a²+b²+c²－ab－bc－ac=0，试判断△ABC的形状，并说明理由（6分）

—I wonder if your wife will go to the party.

—If your wife _____, so_____. [ ]

A. does, does she

B. will, will mine

C. does, will mine

D. will, will I