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 "Down" End Sub Private Sub Form_MouseUp(Button As Integer, Shift_As Integer,X As Single,Y As Single) Print "Up" End SubA) DownUpClick B) ClickDownUp C) DownClickUp D) UpDownClick