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题型：翻译 题类：常考题 难易度：普通
高中英语人教版（新课程标准）2017-2018学年高一下册必修三Unit 4 Astronomy: the science of the stars单元检测试卷
the problem, he felt and there was a look on his face.
他们注意到一个塑料袋在空中漂浮着。
{#blank#}1{#/blank#} can you{#blank#}2{#/blank#} them{#blank#}3{#/blank#} the {#blank#}4{#/blank#}of driverless cars?
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