Private Sub Form_Load( ) Show Text1.Text = "" Text1.SetFocus End Sub Private Sub Form_MouseUp(Button As Integer, Shift As Integer, X AsSingle, Y As Single) Print "程序设计" End Sub Private Sub Text1_KeyDown(KeyCode As Integer, Shift As Integer) Print "Visual Basic"; End Sub 程序运行后,如果按"A"键,然后单击窗体,则在窗体上显示的内容是() A.Visual Basic B.程序设计 C.A程序设计 D.Visual Basic程序设计