He his mistake _______ he saw the bad result with his own eyes.
A:didn't realize; until
B:realized; until
C:didn't realize; when
D:realized; unless
如图,在平行四边形ABCD中,以点A为圆心,AB长为半径画弧交AD于点F,再分别以点B、F为圆心,大于 12 BF长为半径画弧,两弧交于一点P,连
接AP并延长交BC于点E,连接EF.