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题型：语法填空（单句） 题类：常考题 难易度：普通
人教版（PEP）2018-2019学年小学英语五年级上册Unit 6 In a nature park Part A同步训练一
—No, there (be not).
They {#blank#}1{#/blank#} （were/weren't）dirty then.
They {#blank#}2{#/blank#} （are/aren't）clean now.
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