strConn:='Provider=Microsoft.Jet.OLEDB.4.0;' +
           'Data Source=c:=test.xls;' +
           'Persist Security Info=False;'+
           'Extended Properties=Excel 8.0;';  AdoConnection1.Connected:=False;
  AdoConnection1.ConnectionString:=strConn;
  try
    AdoConnection1.Open;
    AdoConnection1.GetTableNames(ComboBox1.Items);
  except
    raise;
  end;
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在AdoConnection1.GetTableNames(ComboBox1.Items);时报错,为什么?