编写如下事件过程:Private Sub Form_ MouseDown (Button As Integer, _Shift As Integer, X As Single, Y As Single)If Shift = 6 And Button = 2 ThenPrint BBBB End IfEnd Sub程序运行后,为了在窗体上输出BBBB,应执行的操作为______ 。
A.同时按下Shift 键和鼠标左键
B.同时按下Ctrl、Alt 键和鼠标右键
C.同时按下Shift 键和鼠标右键
D.同时按下Ctrl、Alt 键和鼠标左键