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    精英家教网 > 初中英语 > 题目详情
    -- 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
    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。
    点评：此类题型主要是确定句子主语与谓语动词的关系。如果是主动关系则用主动语态，反之如果是动宾关系，则用被动语态。注意一些接不带to的不定式做宾语补足语的动词用作被动语态时，不定式符号to要加上。
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