题目内容

7．Attention，please！Smoking            in the reading-room．（　　）
A．isn't allowingB．doesn't allowC．wasn't allowedD．isn't allowed

分析 请注意!吸烟在阅览室里是不被允许的．

解答 答案：D．本题考查的知识点是一般现在时的被动语态．在四个答案里，答案A是现在进行时；B是一般现在时；C是一般过去式的被动语态；根据句子的前一句可知，句子应选用一般现在时，又因句子的主语是动名词smoking，"吸烟"是动作的承受着，故选用一般现在时的被动语态；一般现在时的被动语态的构成是：am/is/are+动词的过去分词；主语为smoking，所以应用is；在句子里的"不被允许做某事"用be not allowed to do sth，故用isn't allowed；故选D．

点评 分析比较法，从时态语态，语义的角度进行综合分析比较．

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