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Unit 1 Tales of the unexplained Grammar and usage （1） Present perfect tense Police in America have stepped up their search for a fifteen-year-old boy who went missing two days ago. Every one has shown great interest in his disappearance due to sightings of puzzling lights in the sky. Some people in Dover also say that they have seen aliens. Police have not ruled out the possibility that Justin was taken by aliens. Photos have been taken and samples have been collected[来自e网通极速客户端]
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课件
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牛津译林版
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必修二 Unit 1 Tale...
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