单选题You use Microsoft .NET Framework 4 to create a Windows Forms application. The application includes a RichTextBox control and a ListBox control. The ListBox control is populated with a list of valid file names. The application allows users to drag a ListBox item to the RichTextBox control. You need to provide a visual indication that a file that is dragged can be dropped on the RichTextBox control. What should you do?（）AUse a DoubleAnimation class.BUse a Storyboard animation class.CUse the DragDropEffects enumeration.DUse the DragAction enumeration.
单选题
You use Microsoft .NET Framework 4 to create a Windows Forms application. The application includes a RichTextBox control and a ListBox control. The ListBox control is populated with a list of valid file names. The application allows users to drag a ListBox item to the RichTextBox control. You need to provide a visual indication that a file that is dragged can be dropped on the RichTextBox control. What should you do?（）
A
Use a DoubleAnimation class.
B
Use a Storyboard animation class.
C
Use the DragDropEffects enumeration.
D
Use the DragAction enumeration.
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