有如下 VB 程序段:
Private Sub Commandl_Click()
Dim s As String, res As String, ch As String
Dim i As Integer
s=Textl.Text:res="":ch=""
For i=1 To Len(s)
ch=Mid(s,i,l)
If Not(ch>="0"And ch<="9"=Then
res=ch+res
End If
Next i
Labell.Caption=res
End Sub
在文本框 Textl 中输入“Qns 2020_GK”后单击按钮 Command1,在标签Labell 中显示( )
A.Qns_GK | B.QnsGK | C.KG_snQ | D.KGsnQ . |