【题目】—There is _______ on using mobile phones 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】A
【解析】考查ban的用法：做名词用，ban是可数的，做动词是“禁止”，句意是：—有个关于在加油站禁止用手机的禁令。—你意思是说在加油站打手机是被禁止的吗？用A。