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 Then Print "BBBB" End If End 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