Jack _____ leave _____ his teacher comes back. [ ]

A. doesn't, until　 　　

B. /, until　　 　　

C. won't, /　　 　　

D. won't, until

企业进行税务管理时要着眼于整体税负的减轻，针对各税种和企业的现实情况综合考虑，力争使通过税务管理实现的收益增加。( )