Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single) If Shift = 6 And Button = 2 Then Print "BBBB" End If End Sub 程序运行后，为在窗体上输出“BBBB”，应执行操作为()。
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Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single) If Shift = 6 And Button = 2 Then Print "BBBB" End If End Sub 程序运行后，为在窗体上输出“BBBB”，应执行操作为()。
