如何让Linq只返回一次相同的重复行

我对此还很陌生，所以请放心。当查询返回多个相同的记录时，我正试图让linq返回单个记录。这是我的：

var query = (from i in _db.BizListView
            let dist = DbGeography.FromText(i.Point).Distance(DbGeography.FromText(geog)) * .0006214
            where
                dist <= rng &&
                i.Name.Contains(key) &&
                pri != -1 ? (i.BizCategoryID == pri && i.Primary == true) : true &&
                biz != -1 ? (i.BizCategoryID == biz) : true  
            group i by new
            {
                ClientID = i.ClientID,
                Name = i.Name,
                Address = i.Address,
                Address1 = i.City + ", " + i.StateID + " " + i.PostCode,
                BizPhone = i.BizPhone,
                EmailAddress = i.EmailAddress,
                ClientImagePath = i.ClientImagePath,
                Distance = DbGeography.FromText(i.Point).Distance(DbGeography.FromText(geog)) * 0.0006214
            }
            into myTable                                                  
            orderby myTable.Key.Distance ascending
            select new 
            {
                ClientID = myTable.Key.ClientID,
                Name = myTable.Key.Name,
                Address = myTable.Key.Address,
                Address1 = myTable.Key.Address1,
                BizPhone = myTable.Key.BizPhone,
                EmailAddress = myTable.Key.EmailAddress,
                ClientImagePath = myTable.Key.ClientImagePath,
                Distance = myTable.Key.Distance                            
            }).Distinct();
return query;

只要指定了BizCategory，查询就会为每个客户端生成一条记录，但如果未指定BizCategories，则会为每个客户端返回多条相同的记录（每个客户端的BizCategorys都有一条记录）。在未指定BizCategory的情况下，如何让查询为每个客户端返回一条记录，而不是多条相同的记录？