VB复制EXCEL表格求助，代码不成功，第一次复制对的，以后都是照片模式

Private Sub CmdExtrOk_Click()
    Dim excel1 As Excel.Application
    Dim excel1book As Excel.Workbook
    Dim excel1sheet As Excel.Worksheet
  

    If CombClass.Text = "" Then MsgBox "请选择起始班组!": Exit Sub
    If ComMonth.Text = "" Then MsgBox "请选择月份!": Exit Sub
   
   
    isFileExist = False
    Set fs = CreateObject("Scripting.FileSystemObject")
   
        For i = 1 To 4
        isFileExist = fs.FileExists(App.Path & "\模块\" & CombClass.Text & "特殊模块\" & ComMonth.Text & ".xls")
    Set excel1 = CreateObject("Excel.Application")
           excel1.Visible = False
      Set excel1book = excel1.Workbooks.Open(App.Path & "\模块\" & CombClass.Text & "特殊模块\" & ComMonth.Text & ".xls")
    Set excel1sheet = excel1book.Worksheets("信号")
    excel1book.ActiveSheet.UsedRange.Copy
      
        '如果模块i.xls存在,则打开它，打开位置指定获取的是班组按钮的值和月份的值
            Set excel1book = Excel.Workbooks.Open(App.Path & "\" & ComMonth.Text & "月份\" & i & "-" & CombClass.Text & ".xls")     '打开2.xls
            excel1book.Sheets.Add Before:=Worksheets(1)                    '新建表格
            Set excel1sheet = excel1book.Worksheets(1)
            excel1sheet.Range("A1").PasteSpecial (xlPasteAll)  '粘贴列宽
            excel1book.Save
           
        '重新生成excel
        '利用mod 4,实现班组名+1，四班循环
         CombClass.ListIndex = (CombClass.ListIndex + 1) Mod 4
          Next i
    excel1.Quit
    Set excel1book = Nothing
    Set excel1sheet = Nothing
    Set excel1 = Nothing
    MsgBox ComMonth.Text + "年表工单生成！"
End Sub