题目内容

— 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
B

试题分析：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.
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