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单项选择题You are developing an ASP.NET Web application. You create a master page. The master page requires a region where you can add page-specific content by using the ASP.NET page designer.  You need to add a control to the master page to define the region. Which control should you add？（）

A、Content

B、ContentPlaceHolder

C、PlaceHolder

D、Substitution

  • B

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