执行下列程序后，鼠标单击窗体，输出结果为（ ）。
Private Sub Form_Click()
Print“Click”；
End Sub
Private Sub Form_MouseDown(Button As Integer，Shift_
As Integer，X As Single，Y As Single)
Print “Donw”
End Sub
Private Sub Form_MouseUp(Button As Integer，Shift_
As Integer，X As Single，Y As Single)
Print“Up”
End Sub