詳見代碼static void Main(string[] args){    List<ScoreModel> scoreList = new List<ScoreModel>(){        new ScoreModel(){Id = 1, Score = 30},        new ScoreModel(){Id = 2, Score = 20},        new ScoreModel(){Id = 3, Score = 30},        new ScoreModel(){Id = 4, Score = 20},        new ScoreModel(){Id = 5, Score = 15},        new ScoreModel(){Id = 6, Score = 10},        new ScoreModel(){Id = 7, Score = 30},        new ScoreModel(){Id = 8, Score = 40},    };    int userScore = 33;    var result = from i in scoreList                    where [how to?]                    select i;                    //獲取i.score小于userScore的最大值                    //即所有小于33的列表中取出最大值30的3個元素                    //期望結果：包含三個元素id=1,3,7的List<ScoreModel>}class ScoreModel{    public int Id { get; set; }    public int Score { get; set; }}