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题型：单选题 题类：常考题 难易度：普通
人教版（PEP）小学英语五年级上册Unit 2 Part B第4课时
—__________ football.
They {#blank#}1{#/blank#} （were/weren't）dirty then.
They {#blank#}2{#/blank#} （are/aren't）clean now.
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