以下代码实现了根据分数返回等级（A: 90-100, B: 80-89, C: 70-79, D: 60-69, F: 0-59）的功能，请选择正确的选项填入①②处。（）grade_map = {90: "A", 80: "B", 70: "C", 60: "D", 0: "F"} def get_grade(score): if score 100: return "无效分数" for key in sorted(grade_map.keys(), reverse=True): if score >= key: return _____①_____ score = int(input()) grade = get_grade(score) print(f"分数 {score} 的等级是 {_____②_____}")
A. ①grade_map[score] ②grade
B. ①key ②get_grade(score)
C. ①grade_map[key] ②score
D. ①grade_map[key] ②grade
正确答案：D
试卷来源：202603 CCF-GESP编程能力等级认证Python四级真题