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．AAAAABBBBB

B．BBBBB

C．AAAAA

D．BBBBB AAAAA