单项选择题
A.add route 220.110.100.1 220.110.100.25 mask 255.255.255.0 B.route add 220.110.101.25 mask255.255.255.0 220.110.100.1 C.route add 220.110.101.25 mask 255.255.255.255 220.110.100.1 D.add route 220.110.1009.1 220.110.101.25mask255.255.255.255