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 ______。
A．AAAAA BBBBB
B．BBBBB
C．AAAAA
D．BBBBB AAAAA