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题型：单选题 题类：常考题 难易度：普通
新目标九年级上同步优化训练Unit 6 When wasit invented？Section B
The water there was{#blank#}1{#/blank#} {#blank#}2{#/blank#}in the past.
— It's very popular. Millions of families ______________ by it during that time.
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