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题型：单选题 题类：常考题 难易度：普通
外研（新标准）版2019-2020学年初中英语七年级上册Module 9 Unit 3同步练习
—I _______ my homework.
Bike sharing {#blank#}1{#/blank#} {#blank#}2{#/blank#} by more and more people now.
There are some chemical factories {#blank#}1{#/blank#} waste water {#blank#}2{#/blank#} the river.
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