Thanks.You ------ it.I could manage it myself A.needn’t doB.

Thanks.You ______ it.I could manage it myself A.needn’t doB.needn’t have done C.mus...
Thanks.You ______ it.I could manage it myself A.needn’t doB.needn’t have done C.mustn’t do D.shouldn’t have done中B和D有什么区别?
Catherine,I have cleaned the room for you.