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var query = from a in T_A
where a.Age == 20
group a by a.ClassID into g
select g.OrderByDescending(x=>x.CreateTime).First();
var query = db.T_A.Where(x=>x.Age == 20)
.GroupBy(x=>x.ClassID)
.Select(g=>g.OrderByDescending(x=>x.CreateTime).First());