— What do you think we can do for our aged parents?

— You _____ do anything except to be with them and be yourself. [ ]

A. mustn't

B. oughtn't to

C. don't have to

D. can't

下列哪些应纳入对员工行为约束的案防管理范畴（）

A、员工入职前背景考察

B、八小时内外行为规范

C、员工参与民间借贷

D、员工过度消费及负债