单项选择题

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 Sub