设P(x,y),∵满足 AP = 1 2 PB ,∴(x-3,y+4)= 1 2 (-9-x,2-y).∴ x?3= 1 2 (?9?x) y+4= 1 2 (2?y) ,解得 x=?1 y=?2 .∴P(-1,-2).故选D.