1. (2019高二下·嘉兴期末) 有如下VB程序段：

Private Sub Command1_Click()

  Dim s As String, a As String, t As String

  s = Text1.Text: t = ""

  For i = 1 To Len(s)

    a = Mid(s, i, 1)

    If a >= "0" And a <= "9" Then

      t = t + a

    ElseIf a = "!" Then

      t = ""

    ElseIf t <> "" Then

      List1.AddItem t

    End If

  Next i

End Sub

在文本框Text1中输入“12+23=35!456Ye”，单击按钮“Command1”后，在列表框List1中显示的结果是（  ）

A . B . C . D .