问题
选择题
— Excuse me, sir, smoking in the gas station.
— Oh, I'm really sorry.
A. doesn't allow B. isn't allowed C. aren't allowed
答案
答案：B
题目分析：句意：---打扰了，先生，在气站不允许吸烟。---奥，真的对不起。doing sth. be allowed 做某事被允许。Smoking做主语用系词be的三单形式。故选B.