A:will be; would
B:would be, will
C:were, will
D:should be, would
距南极洲最近的大洲是图中的( )
如图,在△ABC中,已知∠ABC和∠ACB的平分线相交于点F,过点F作DE∥BC,交AB于点D,交AC于点E,若BD+CE=9,则线段DE的长为( )