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    19．I admire my English teacher．I can remember very few occasions     she stopped working because of ill health．（　　）
    A．thatB．whenC．whereD．which

    分析 我很佩服我的英语老师．我记得她几乎没有因为身体不好而不上班的时候．

    解答 答案：B  题干中she stopped working because of ill health修饰名词occasions，是一个定语从句；从句中结构完整，要用关系副词；when表示时间，where表示地点；句意表达的是时间，故选B．

    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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