单选题 对窗体编写如下事件过程：
Private Sub Form_ MouseDown(Button As Integer，Shift As Integer，X As Single，Y As Single)
If Button =2 Then
Print “AAAAA”
End If
End Sub
Private Sub Form_ MouseUp (Button As Integer，Shift As Integer，X As Single，Y As Single)
Print “BBBBB”
End Sub
程序运行后，如果单击鼠标右键，则输出结果为______ 。