单选题:下列电子邮件地址中正确的是( )。(其中■表示空格)

题目内容:
下列电子邮件地址中正确的是( )。(其中■表示空格) A.Malin&ns.cnc.ac.cn
B.malin@ns.cac.ac.cn
C.LinMa&ns.cnc.ac.cn
D.Lin—Ma@ns.cnc.ac.cn

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