“介词关系代词”引导定语从句的几种情况 先来看课本第18单元语法部分的练习（人教高二下P61）中的几个句子： (1) The room in which we took the photos was very dusty. (2) The wires with which the machines were connected were very (3) The four ancient Chinese inventions of which we are proud have remained important in human history for thousands of years. 上述三个定语从句中的关系代词前分别用了不同的介词，同学们对于定语从句中关系代词、关系副词的选择可能不会感到什么困难，但对于“介词关系代词”引导的定语从句中介词的选择却可能会感到迷惑。“介词关系代词”引导的定语从句在近几年的高考题中出现的频率颇高，而且变化多样，希望下文的总结能帮助同学们突破这一难关。
