The old man _____ our maths teacher. [ ]

A. maybe

B. may be

C. maybe not

D. may be not

严格划定城镇规模边界和扩展边界，遏制建设用地无序扩张，促进形成大城市组团式发展、中小城市紧凑发展和小城镇集聚发展。