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题型：单选题 题类：常考题 难易度：普通
广东中考人教新目标（Go for it）九年级Units1－3教材梳理
—Yes. Let's start.
The river will {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} waste if people keep polluting it.
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