(32) 設已經在菜單編輯器中設計了窗體的快捷菜單，其頂級菜單為Bt，取消其"可見"屬性，運行時，在以下事件過程中，可以使快捷菜單相應鼠標右鍵菜單的是

　　A) Private Sub Form_MouseDown(Button As Integer, Shift As Integer, _

　　X As Single, Y As Single)

　　If Button=2 Then PopupMenu Bt, 2

　　End Sub

　　B) Private Sub Form_MouseDown(Button As Integer, Shift As Integer, _

　　X As Single, Y As Single)

　　PopupMenu Bt

　　End Sub

　　C) Private Sub Form_MouseDown(Button As Integer, Shift As Integer, _

　　X As Single, Y As Single)

　　PopupMenu Bt,0

　　End Sub

　　D) Private Sub Form_MouseDown(Button As Integer, Shift As Integer, _

　　X As Single, Y As Single)

　　If (Button=vbLeftButton) Or (Button=vbRightButton) Then PopupMenu Bt

　　End Sub

　　正確答案: A