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句型20 which引导的非限制性定语从句（也引导限制性定语从句） which引导的非限制性定语从句既可以指整个句子内容，也可以指句子的部分内容（如单词或词组等），在句子中可以作主语、宾语（动词或介词的）、定语等。注意它在句子中的位置：只能放在主句后，不能放在主句前。表达的内容是“不好的”、“事先没有预料到的”等时，常用which，只指物。 [例句] Yellowstone National Park, which is in Wyoming, is one of the most beautiful national parks in the world. 黄石国家公园位于怀俄明州，是世界上最美丽的国家公园之一。 The clock, which my grandfather bought, is still in good order. 这时钟是我祖父买的，现在还走时很准。 The picture, for which he paid an enormous amount of money, was a forgery. 那幅画他花了一大笔钱购买，却是幅赝品。 She changed her mind again, which made us all angry. 她又改变了主意，这使我们大家都生气了。 I lived three years in Paris, during which time I learned French. 我在巴黎住了三年，在那期间我学了法语。 The weather turned out to be very good, which was more than we could expect. 天气结果转晴， 这是我们没有预料到的 | 
