编写一个删除数字字符串s中的最大和次大数字字符的程序。具体功能如下:在文本框Text1中输入一个数字字符串,单击“删数”按钮Command1,将删除后的结果显示在文本框Text2中。程序运行界面如下图所示。

(1)要使程序运行时,按钮Command1上显示的标题为“删数”,可在Form_Load事件处理过程中添加语句________(单选,填字母:
A.Caption.Command1 ="删数" / | B.Command1.Caption ="删数" / | C.Caption ="删数"/) |
(2)实现上述功能的VB程序如下,请在划线处填入合适的代码。
Private Sub Command1_Click()
Dim s As String, ch As String
Dim i As Integer, n As Integer
Dim max1 As Integer, max2 As Integer
s = Text1.Text: n = Len(Text1.Text)
If Mid(s, 1, 1) > Mid(s, 2, 1) Then
max1 = 1: max2 = 2
Else
max1 = 2: max2 = 1
End If
For i = 3 To n
ch = Mid(s, i, 1)
If ch > Mid(s, max1, 1) Then
①_______
max1 = i
ElseIf ch >= Mid(s, max2, 1) Then
max2 = i
End If
Next i
For i = 1 To n
If
②_________ Then Text2.Text = Text2.Text & Mid(s, i, 1)
Next i
End Sub
(3)若在文本框Text1中输入的内容为“82176736”,单击按钮Command1,文本框Text2中显示的内容是________。