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题型：翻译 题类：常考题 难易度：普通
北师大版英语九年级全册 Unit 8 Discoveries. Lesson 22 Famous Discoveries.同步练习
Maybe you fear that they won't find the solutions to the problem of air pollution.
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Did you {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} {#blank#}4{#/blank#}yesterday?
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{#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} {#blank#}4{#/blank#}our learning is helping each other.
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