must&have to

Here at the ABC Company,you_______come to work late.
A don't have to
b have to
c mustn't
d must

must与have to? MUST 和 HAVE TO区别 比较have to和must must和have to的具体区别 have to 和 must 的区别？？ have to和must怎么区分呀？ have to与must的区别 have to与must的差别 must与have to的区别 have to 和must 有什么不同?