假定已经在菜单编辑器中建立了窗体的弹出式菜单,其顶级菜单的名称为al,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 Blltton=2Then PopupMenu a1 End If End SubB.Private Stlb Form_MouseDown(Button As Integer,_Shift As Integer,X As Single, Y As Single) PopupMenu a1 End SubC.Private Sub Form—MouseDown(Button As Integer,_Shift As Integer,X As Single, Y As Single) If Button=1 Then PopupMenu a1 End If End SubD.Private Sub Form. MouseDown(Button As Integer,_Shift As Integer,X As Single, Y As Single) If Buttcn=2 Then PopupMenu a1 End If End Sub

假定已经在菜单编辑器中建立了窗体的弹出式菜单,其顶级菜单的名称为al,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 Blltton=2Then PopupMenu a1 End If End Sub

B.Private Stlb Form_MouseDown(Button As Integer,_Shift As Integer,X As Single, Y As Single) PopupMenu a1 End Sub

C.Private Sub Form—MouseDown(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 Buttcn=2 Then PopupMenu a1 End If End Sub


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