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单项选择题 You are implementing an ASP.NET page that includes the following drop-down list. You need to dynamically add values to the end of the drop-down list. What should you do? （）

A、Add the following OnPreRender event handler to the asp：DropDownList

B、Add the following OnPreRender event handler to the asp：DropDownList

C、Add the following event handler to the page code-behind.

D、Add the following event handler to the page code-behind.

  • B

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