单项选择题 You are developing a Windows Presentation Foundation (WPF) application The application is for commercial use and requires a valid license key to be entered. You create a project type of Class Library code to validate license keys You need to ensure that the user enters a valid license key during installation of the software. Which deployment should reference the class library?（）
单项选择题 You are developing a Windows Presentation Foundation (WPF) application. You are implementing a test strategy for the application. You need to ensure that the test class can repeat user input. From which base class should the test class inherit?（）
单项选择题 You are developing a Windows Presentation Foundation (WPF) application.You need to display HTML content from a Web page on the WPF form. What should you do?（）
