单项选择题

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 ______ 。

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