单选题 编写如下程序：
Private Sub Form_Click()
Print "Welcome!"
End Sub
Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
Print "欢迎!"
End Sub
Private Sub Form_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single)
Print "热烈欢迎!"
End Sub
程序运行后，单击窗体，输出结果为______。