中国大学MOOC: 请分析下面的程序，若输入score为80，输出grade为【 】if score >= 60.0: grade=Delif score>=70.0: grade=Celif score>=80.0: grade=Belif score>=90.0: grade=Aprint(grade)
中国大学MOOC: 请分析下面的程序，若输入score为80，输出grade为【 】if score >= 60.0: grade=Delif score>=70.0: grade=Celif score>=80.0: grade=Belif score>=90.0: grade=Aprint(grade)
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