John ,you need not do your work today,you--do it tomorrow if you are tired.a,must b may c can not

问题描述:

John ,you need not do your work today,you--do it tomorrow if you are tired.a,must b may c can not
选哪个?为什么?

B
意思是John,你不必今天工作,如果你累了,可以明天再做.
must必须
may可以,可能
can not不能
根据意思可以判断出选B.
不过如果要我填的话我会写can.