John ,you need not do your work today,you--do it tomorrow if

John ,you need not do your work today,you--do it tomorrow if you are tired.a,must b may c can noti am sorry i did not win the game .-well,that is ok,you ---win every time.A must not B can not C should not D may not 请说明原因谢谢D 为什么?有两个问题,