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来源：雅诚德英语网
Select the 3.5 Framework, click OK, and the project will be closed and reopened.
选择 .NET Framework 3.5 ，单击OK，然后项目将关闭并重新打开。
Select the 3.5 Framework, click OK, and the project will be closed and reopened.
选择 .NET Framework 3.5 ，单击OK，然后项目将关闭并重新打开。