如何使匹配的答案与问题串出现

我试图创造一个简单的游戏，玩家必须回答问题。到目前为止，我只能显示问题，但我正在尝试显示与问题匹配的3个可能的答案。

问题是，虽然我可以显示问题，但所有问题都会很快显示出来。我想要的是，当我开始游戏时，它应该从第一个问题开始，然后等待1分钟，然后显示第二个问题，以此类推。这些问题必须随机给出。我还希望显示3个答案。

我有一个问题列表，我存储我所有的问题和答案。整型是正确答案。

这是我的代码:

private SpriteFont _verdana;
private List<Question> questions = new List<Question>();
public class Question
{
    public string questionString;
    public List<string> answers = new List<string>();
    public int correctAnswer = 0;
    public bool answered = false;
    public Question(string question, string answer1, string answer2, string answer3, int correctAnswer)
    {
        questionString = question;
        answers.Add(answer1);
        answers.Add(answer2);
        answers.Add(answer3);
        this.correctAnswer = correctAnswer;
    }
}
public Level(Game1 game)
{
    _verdana = game.Content.Load<SpriteFont>("Verdana");
        Question q = new Question("Question1", 
            "Answer1", 
            "Answer2", 
            "Answer3", 
            0);
        questions.Add(q);
        q = new Question("Question2?", 
            "Answer1.", 
            "Answer2.", 
            "Answer3.", 
            0);
}
Random r = new Random();
public void Draw(SpriteBatch spriteBatch)
{
            spriteBatch.DrawString(_verdana, questions[r.Next(0, questions.Count - 1)].questionString, new Vector2(80, 325), Color.White);
}