设已经在菜单编辑器中设计了窗体的快捷菜单,某顶级菜单为a1,且取消其“可见”属性。运行时,以下( )事件过程可以使快捷菜单的菜单项响应鼠标左键单击和右键单击。

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问题 设已经在菜单编辑器中设计了窗体的快捷菜单,某顶级菜单为a1,且取消其“可见”属性。运行时,以下(    )事件过程可以使快捷菜单的菜单项响应鼠标左键单击和右键单击。

选项 A、Private Sub Form_Mouse Down(Button As Integer,Shift As Integer,_X As Single,Y As Single)    If Button=2 Then PopupMenu a1,2    End Sub   
B、Private Sub Form Mouse Down(Button As Integer,Shift As Integer,_X As Single,Y As Single)    PopupMenu a1,0    End Sub  
C、Private Sub Form_Mouse Down(Button As Imeger,Shift As Integer,_X As Single,Y As Single)    PopupMenu a1    End Sub   
D、Private Sub Form_Mouse Down(Button As Integer,Shift As Integer,_X As Single,Y As Single)    If (Button=vbLetfButton)Or(Button=vbRightButton)Then PopupMenu a1    End Sub

答案A

解析
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