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 “Donw”  End Sub  Private Sub Form_MouseUp(Button As Integer,Shift_         As Integer,X As Single,Y As Single)     Print“Up”  End Sub

A.DownUpClick
B.ClickDownUp
C.DownClickUp
D.UpDownClick