A． Private Sub Form _ Mouse Up(Button As Integer，Shift AS Integer，_ X As Single，Y As Single) If Button=2 Then PopupMenu mnuEdit，vbPopupMenuCenterAlign Or_ vbPopupMenuRightButton，X，Y，mnuEditOpen End If End Sub B． Private Sub Form _ MouseUp(Button AS Integer，Shift AS Integer，_ X As Single，Y As Single) If Button=2 Then PopupMenu mnuEdit， End If End Sub C． Private Sub Form _ MouseUp(Button AS Integer，Shift AS Integer，_ X As Single，Y As Single) PopupMenu mnuEdit，vbPopupMenuCenterAlign Or_ vbPopupMenuRightButton End Sub D． Private SUb Form _ MouseUp(Button AS Integer，_ Shift As Integer，X As Single，Y As Single) If Button=2 Then PopupMenu mnuEdit，2 End If End Sub