-- Excuse me sir smoking in the gas station.-- Oh Im really sorry.A. doesnt allow B.

问题补充：

-- Excuse me, sir, smoking in the gas station.

-- Oh, Im really sorry.

A. doesn allow B. isn allowed C. aren allowed

答案：

解析：句意：打扰了先生，在加油站是不允许吸烟的。结合语境可知本句主语是被允许的对象，故用被动语态，smoking表示抽象含义，故谓语动词用单数。被动语态一般由be动词加动词的过去分词构成，故选B。