题干
—I'm sorry, Mr.Hu.I _______ my English exercise book at home. I'm sure I finished _______ my homework.
—It doesn't matter. Please remember _____it here this afternoon.
A：left; doing; to bring
B：forgot; doing; to take
C：took; to do; bringing
答案(点此获取答案解析）
A
，
满足约束条件
，若目标函数
（
，
）的最大值为12，则
的取值范围是（ ）
