题干
Sun Cinema is ________ of all three.
A：cheapest
B：most cheap
C：the cheapest
D：the most cheap
答案(点此获取答案解析）
C
Sun Cinema is ________ of all three.
A：cheapest
B：most cheap
C：the cheapest
D：the most cheap
，且有
，若
且
，则
的最大值为
