—              I tell John about it?

                     —No, you needn’t. I have told him already.

       A．Must                   B．Will                     C．Can                    D．May

— Must I tell John about it?

— No, you _______. I have told him already.

　　 A. can’t 　　　　 B. don’t　　　　　　　　　　　　 C. needn’t　　　　　　　　　　 D. mustn’t