查询主体必须以select子句或group子句结束

Question

我的linq声明出了什么问题，我做错了什么？

var query = from c in db.Customers
                        from o in c.Orders
                 .Where(s => s.City == "London")
                 .OrderBy(s => s.CustomerID)
                 .Select(s => new { s.CustomerID, s.City, s.OrderID }).ToList();