如何在在线答题中添加题目的组合和拆解题

// 题目的数据结构
class Question:
    def __init__(self, content, answer):
        self.content = content
        self.answer = answer
        self.sub_questions = []  # 记录拆解后的子问题

    def add_sub_question(self, sub_question):
        self.sub_questions.append(sub_question)

    def get_sub_questions(self):
        return self.sub_questions


// 题库的数据结构
class QuestionBank:
    def __init__(self):
        self.questions = []

    def add_question(self, question):
        self.questions.append(question)

    def get_questions(self):
        return self.questions


// 在线答题系统的界面
class OnlineQuiz:
    def __init__(self, question_bank):
        self.question_bank = question_bank

    def display_combined_questions(self):
        questions = self.question_bank.get_questions()
        for question in questions:
            if len(question.get_sub_questions()) > 0:
                # 显示组合题目
                print(question.content)
                for sub_question in question.get_sub_questions():
                    print(sub_question.content)
            else:
                print(question.content)

    def display_split_questions(self, question):
        sub_questions = question.get_sub_questions()
        for sub_question in sub_questions:
            print(sub_question.content)

    def submit_answer(self, question, answer):
        # 提交答案的逻辑
        if len(question.get_sub_questions()) > 0:
            # 拆解题的逻辑
            self.display_split_questions(question)
        else:
            # 单个题目的逻辑
            print(question.content)

        # 判断答案是否正确的逻辑
        if answer == question.answer:
            print("答案正确")
        else:
            print("答案错误")