题目内容
（请给出正确答案）
[主观题]
假定已经在菜单编辑器中建立了窗体的弹出式菜单，其顶级菜单项的名称为a1，其“可见”属性为False。程
序运行后，单击鼠标左键或右键都能弹出菜单的事件过程是
A．Private Sub Form_MouseDown(Button As Integer，_ Shift As Integer，X As Single，Y As Single) If Button=1 And Button=2 Then PopupMenu a1 End If End Sub
B．Private Sub Form_MouseDown(Button As Integer，_ Shift As Integer，X As Single，Y As Single) PopupMenu a1 End Sub
C．Private Sub Form_MousoDown(Button As Integer，_ Shift As Integer，X As Single，Y As Single) If Button=1 Then PopupMenu a1 End If End Sub
D．Private Sub Form_MouseDown(Button As Integer，_ Shift As Integer，X As Single，Y As Single) If Buaon=2 Then PopupMenu a1 End If End Sub
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