单项选择题

A.ContentB.ContentPlaceHolderC.PlaceHolderD.Substitutio……

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

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