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- 单项选择题 You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You add a ListBox to show grouped data. The ListBox is data-bound to a collection of items. Each item has the Name and State properties. You need to ensure that the ListBox meets the following requirements: Names grouped by State Names sorted in ascending order States sorted in descending order Which code fragment should you use?（）
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- A
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