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单项选择题 You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You plan to create a window that has a layout as shown in the following exhibit. You need to define the code fragment to create the window layout. You also need to ensure that the window contains a splitter line. Which code fragment should you use?（）

A、

B、

C、

D、

  • C

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