(24) 在以下事件過程中，可以在用戶按下鼠標右鍵時，顯示一個上邊框，以鼠標當前位置為中心的彈出式菜單，而且這個彈出式菜單還可以識別右鍵對菜單命令的選擇，相應的選項是

　　A) Private Sub Form_MouseUp(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

　　正確答案: A