题目

有如下VB程序段： Dim i As Integer Dim c As String， s As String， t As String s = "2021 PYthon": t = "" For i = 1 To Len(s)     c = Mid(s， i， 1)     If c >= "a" And c <= "z" Then         t = t + c     ElseIf c >= "0" And c <= "9" Then         t = c + t     End If Next i Text1.Text = t 执行该程序段后，文本框Text1中显示的内容是（    ） A . 2021thon B . 1202thon C . thon1202 D . noht1202 答案：B

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