对窗体编写如下事件过程：
Private Sub Form _ MouseDown(BuRon 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 ______。
A．AAAAA
BBBBB
B．BBBBB
C．AAAAA
D．BBBBB
AAAAA
