问题：
[单选题]用DEFINE CLASS命令定义一个Myform类时，要想为该类添加一个按钮对象，应当使用的基本代码是( )
A、Addobject("commandl"，"commandbutton")
B、Myform．Addobject("commandl"，"commandbutton")
C、AddObjectMyform．Commandl AS commandbutton
D、Add Object Commandl AS commandbutton
参考答案：
D
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