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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.  You create a page that contains the following control.   You write the following code segment in the code-behind file for the page.  Private Sub LoadDate（ByVal sender As Object， _ByVal e As EventArgs）  If IsPostBack Then  calBegin.SelectedDate = _  DirectCast（ViewState（"date"）， DateTime） End If  End Sub  Private Sub SaveDate（ByVal sender As Object， _ByVal e As EventArgs）  ViewState（"date"） = calBegin.SelectedDate  End Sub  You need to ensure that the calBegin Calendar control maintains the selected date. Which code segment should you insert in the constructor of the page？ （）

A、A

B、B

C、C

D、D

  • D

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