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    精英家教网 > 高中英语 > 题目详情
    20．Some people wear masks only in crowds，_____ they expect to come into contact with lots of germs．（　　）
    A．whichB．whenC．whereD．as

    分析 一些人只会在他们认为容易接触病菌的人群中戴口罩．

    解答 答案：C
    题干中they expect to come into contact with lots of germs修饰前面的名词crowds，是一个非限制性定语从句；从句结构完整，要用关系副词；when表示时间，where表示地点．句意表达的是抽象地点，故选C．

    点评 定语从句是用来修饰名词的形容词性从句，相当于一个形容词．连接定语从句的引导词分为关系代词和关系副词，关系代词在从句中要作主语或宾语；关系副词在从句中作状语．这也是选择关系词的一个判断方法．

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