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介词、介系词(英语：adposition)在语法里是一个用来表现一个字的文法功能的词汇或字缀。 而关系代词用来引导定语从句。它代表先行词，同时在从句中作一定的句子成分。关系代词有主格，宾格和属格之分，并有指人与指物之分。下面整理下关于介词和关系代词的专题练习： 一、句型转换(每空限填一词)： 1. They live in a house, whose windows are made of glass. They live in a house, ________ ________ ________ ________ are made of glass. 2. He has two daughters, and both of them are college students. He has two daughters, ________ ________ ________ are college students. 3. China has hundreds of islands, the largest of which is Tai Wan. China has hundreds of islands, ________ ________ the largest is Tai Wan. 4. Can you think of a situation where this word is used? Can you think of a situation ________ ________ this word is used? 5. China has a lot of famous writers and Lu Xun is one of them. China has a lot of famous writers, one ________ ________ is Lu Xun. 6. This was the real reason why he was late for yesterday's meeting. This was the real reason ________ ________ he was late for yesterday's meeting. | 
