问题补充：
–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：
(答案→)A. a ban; is banned
B. ban; banned
C. a ban; banned
D. ban; is banned
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。
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