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

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问题 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 = 1 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______。

选项 A、同时按下Shift 键和鼠标左键
B、同时Ctrl、Alt 键和鼠标左键
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

答案B

解析
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