JavaScript JSON dosyasından rastgele alınan verinin tekrarlanmaması nasıl çözülür?

 _this.insertQuestion = function (data) {
 var questionIndex = Math.floor(Math.random() * data.results.length); // Rastgele bir soru
 var question = data.results[questionIndex];

 var incorrectAnswers = question.incorrect_answers;
 var correctAnswer = _this.htmlDecode(question.correct_answer);
 var allAnswers = _this.shuffle(
 incorrectAnswers.concat(correctAnswer)
 );
 var idxCorrAns = allAnswers.indexOf(correctAnswer);
 _this.setState({
 question: question.question,
 correctAnswer: correctAnswer,
 idxCorrAns: idxCorrAns,
 canAnswer: [true, true, true, true],
 allAnswers: allAnswers,
 loading: false,
 });
 };

 _this.getQuestion = function () {
 if (_this.state.name === "1")
 fetch("./deneme1.json")
 .then(function (data) {
 if (data.ok) {
 return data.json();
 } else {
 throw new Error("Veriyi alırken sorun yaşandı.");
 }
 })
 .then(function (data) {
 _this.insertQuestion(data);
 })
 .catch(function (error) {
 console.log(error);
 });
 };

{
    "1": {
        q: "Soru 1",
        a: "Cevap 1"
    },
    "2": {
        q: "Soru 2",
        a: "Cevap 2"
    },
    "3": {
        q: "Soru 3",
        a: "Cevap 3"
    },
}

{
    "response_code": 0,
    "results": [
        {
            "question": "a",
            "correct_answer": "b",
            "incorrect_answers": [
                "c",
                "d",
                "e"
            ]
        },
        {
            "question": "a",
            "correct_answer": "b",
            "incorrect_answers": [
                "c",
                "d",
                "e"
            ]
        },
        {
        {
            "question": "a",
            "correct_answer": "b",
            "incorrect_answers": [
                "c",
                "d",
                "e"
            ]
        }
    ]
}