假定编写如下事件过程: Private Sub Form_MouseDown(Button As Integer,Shift As Integer,X As Single,Y As Single)  If(Button and 3)=3 the

admin2012-03-22  18

问题 假定编写如下事件过程:    Private Sub Form_MouseDown(Button As Integer,Shift As Integer,X As Single,Y As Single)     If(Button and 3)=3 then      Print"Hello"     End if    End Sub    程序运行后,为了在窗体上输出“Hello”,应该窗体上执行以下(    )操作。

选项 A、只能按下左键并拖动  
B、只能按下右键并拖动   
C、必须同时按下左、右键并拖动
D、按下左键拖动或按下右键拖动

答案C

解析
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