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1.We ate great meals cooked by experts！
2.We saw abandoned farms which were built more than a hundred years ago.
3.For many years, trained camels carried food and other supplies, and returned with wool and other products.
4.One night, at about midnight, I watched the night sky for about an hour.
5.A hundred and fifty years ago, they brought some camels from Afghanistan.
6.In 1925, they passed a law which allowed people to shoot the animals if they were a problem.
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1.例句1、2、3中的过去分词(短语)在句中作定语。
2.例句2、3中为单个的过去分词作定语，常常放在被修饰名词的前面；例句1中为过去分词短语作定语，应放在被修饰名词的后面。
3.例句4、5、6中的时态为一般过去时，都和表示过去的时间状语连用。
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