随机答案未正确显示

Question

我正在进行多项选择测验，将答案放在一个随机的地方，但由于某种原因，它从未显示所有选项。当我使用一个消息框时，它会显示所有答案都在数组中（例如：a，b，d，c），但在测验自我中，它会多次显示一些答案（例如：a，d， a，a）我无法弄清楚我的代码中出了什么问题。

public string AskQuestion()
    {
        question = startString + list[0];
        correct = list[1].Trim();
        Random antw = new Random();
        string[] answers = new string[list.Length-1];

        if (kind == true)
        {
            try
            {
                System.Windows.Forms.RadioButton[] radioButtons = new
                    System.Windows.Forms.RadioButton[list.Length];
                for (int i = 1; i < list.Length; i++)
                {
                    answers[i - 1] = list[i].Trim();
                }
                string[] randomAnswers = answers.OrderBy(o => antw.Next()).ToArray();
                for (int i = 1; i < list.Length; i++)
                {
                    radioButtons[i] = new RadioButton();
                    radioButtons[i].Text = randomAnswers[i-1].Trim();
                    radioButtons[i].Location = new System.Drawing.Point(6, i * 18);

                    grp.Controls.Add(radioButtons[i]);
                }
                if (list.Length == 4)
                {
                    MessageBox.Show(randomAnswers[0] + " " + randomAnswers[1] + " " + randomAnswers[2]);
                }
                else if (list.Length == 5){
                    MessageBox.Show(randomAnswers[0] + " " + randomAnswers[1] + " " + randomAnswers[2] + " " + randomAnswers[3]);
                }
            }
            catch (IndexOutOfRangeException ioore)
            { MessageBox.Show(ioore.Message); }
        }
        return question;
    }