单选题执行下列程序后，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 "Donw"

End Sub

Private Sub Form_MouseUp(ButtonAs Integer，Shift As Integer，X As Single，Y As Single)

Print "Up"

End Sub

A、 DownUpClick
B、 ClickDownUp
C、 DownClickUp
D、 UpDownCliek

【正确答案】 A

【答案解析】[解析] 鼠标单击时，依次引发MouseDown、MouseUp和Click事件，即Click事件包含鼠标按下和放开事件。