[单项选择题] 假定编写如下事件过程： Private Sub Form_MouseDown(Button As Integer,Shift As Integer,X As Single，Y As Single) 　If(Button and 3)=3 then 　　Print"Hello" 　End if End Sub 程序运行后，为了在窗体上输出“Hello”，应该窗体上执行以下( )操作。_考试资料记录