A:shouldn’t have gone
B:mustn’t have gone
C:couldn’t have gone
D:mightn’t have gone
下列说法正确的是 ( )
如图,在菱形ABCD中,过点B作BE⊥AD,BF⊥CD,垂足分别为点E,F,延长BD至G,使得DG=BD,连结EG,FG,若AE=DE,则 EGAB =____.