(单选题)21: 默认启动"Windows Media Player"的方法是单击()
A: 程序→启动→辅助工具→Windows Media Player
B: 程序→系统→辅助工具→Windows Media Player
C: 程序→附件→娱乐→Windows Media Player
D: 控制面板→附件→娱乐→Windows Media Player
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