题干
–There is _______ on using mobile phones at the gas station.
--Do you mean talking on the mobile phone ________ at the gas station?
--Do you mean talking on the mobile phone ________ at the gas station?
A：a ban; is banned
B：ban; banned
C：a ban; banned
D：ban; is banned
答案(点此获取答案解析）
A
表示的曲线是（ ）