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题型：句子翻译 题类： 难易度：困难
人教版(2019)选择性必修第册Unit 5 Poems reading and thinking 单元基础知识检测
According to the {#blank#}1{#/blank#} of relativity, nothing can travel faster than light.
It happened {#blank#}1{#/blank#} when I got off the train.
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