题目内容

18．Teenagers have reached a point in their life _______ they are supposed to make decisions of their own for the first time．（　　）
A．whichB．whereC．howD．why

分析 青少年已经来到了他们人生的一个关键点，他们要第一次作出他们自己的决定了．

解答 答案：B
题干中they are supposed to make decisions of their own for the first time修饰名词point，是一个定语从句；从句结构完整，要用关系副词；先行词point表示抽象地点，要用where来引导．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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