问题：
[单选题]若用户在一段时间____，Windows 将启动执行已设置的屏幕保护程序。
A、没有按键盘
B、没有移动鼠标器
C、既没有按键盘，也没有移动鼠标器
D、没有使用打印机
参考答案：
C
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