—Could you buy some bread _____ your way _____?  

— Sure.

A．on ; to home

B．on; home

C．in ; home

D．on; at home

已知一棵二叉树的先根序列为ABCDEFK，中根序列为DGBAFCK，则结点的后根序列为( )。

A．ACFKDBG

B．GDBFKCA

C．KCFAGDB

D．ABCDFKG