单选题：微机上广泛使用的Windows2000是（　　）。

题目内容：

微机上广泛使用的Windows2000是（　　）。 A．多用户多任务操作系统
B．单用户多任务操作系统
C．实时操作系统
D．多用户分时操作系统

参考答案：

答案解析：

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