题目内容

16．In China and some other countries，it is impolite to speak loudly _______ you are having a meal．（　　）
A．beforeB．whileC．after

分析 在中国和其他一些国家吃饭的时候大声说话是不礼貌的．

解答 答案：B  本题考查连词的用法，before，在…之前；while，当…的时候；after，在…之后；根据关键词you are having a meal．可知是时间状语从句，并且是进行时态，用while引导；故选B．

点评 本题考查连词的用法，特别要区分when和while引导的时间状语从句，在应用时要熟练掌握．

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