transactionscope报“此操作对该事务的状态无效”问题

using (TransactionScope scope = new TransactionScope(TransactionScopeOption.Required, new TimeSpan(6000000000)))
 {
　  //保存内容
 scope.Complete();
 }

          using (TransactionScope scope = new TransactionScope(TransactionScopeOption.Required))
          {
                Event en = new English();         //这里执行一个操作，读取一个数据库的数据如（DB1）
                en.Say(); 
                using (TransactionScope scope2 = new TransactionScope(TransactionScopeOption.RequiresNew))
                {
                    Event ch = new Chinese();    //这里执行一个操作，读取第二个数据库的数据（DB2）
                    ch.Say();
                    scope2.Complete();
                }
                scope.Complete();
            }