var query= from s in db.SCORE
           Group s by new {s.CARD,s.DATE,s.ID} into g
            where g.Count()>1
            order by g.Key.DATE
            select  new
             {
                 g.Key.CARD,
                 g.Key.DATE,
                 g.Key.ID
             };

------解决方案--------------------
linq没错,查询是否有事务加载??