【加试题】如图所示,a 、b 、c 三个数比较大小,单击“求最大值”按钮,在文本框Text4中输出三者之间最大的数,选出不能实现该功能的程序段( )
![](http://tikupic.21cnjy.com/65/4a/654a15b2765ad78d91056e7a7356ec47.jpg)
A、If a >= b And a >= c Then Text4.Text = Str(a)If b >= a And b >= c Then Text4.Text = Str(b)If c >= a And c >= b Then Text4.Text = Str(c)
B、Max = aIf b > Max Then Max = bIf c > Max Then Max = cText4.Text = Str(Max)
C、If a > b And a > c Then Text4.Text = Str(a)ElseIf b > a And b > c Then Text4.Text = Str(b)Else Text4.Text = Str(c)End If
D、If a > b Then If a > c Then Text4.Text = Str(a) Else Text4.Text = Str(c)Else If b > c Then Text4.Text = Str(b) Else Text4.Text = Str(c)End If