(单选题)8: 第三代移动通信系统也简称（ ），又被国际电联（International Telecommunication Union，ITU）称为IMT-2000（International Mobile Telecommunications in the year 2000），意指在2000年左右开始商用并工作在2000MHz频段上的国际移动通信系统。
A: B3G
B: 2.75G
C: 2G
D: 3G
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