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单项选择题 You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5.  Your application has a user control named UserCtrl.ascx. You write the following code fragment to create a Web page named Default.aspx.  You need to dynamically add the UserCtrl.ascx control between the lblHeader and lblFooter Label controls.  What should you do? ()

A、

B、

C、

D、

  • D
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