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【单选题】
当在Windows操作系统中打开了多个应用程序时，切换窗口应使用的快捷键是( )。
A.
Alt+Tab
B.
Alt+F4
C.
Shift+Tab
D.
Shift+Esc
拍照语音搜题，微信中搜索"皮皮学"使用
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