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题型：单选题 题类：常考题 难易度：普通
牛津上海(本地版)五四制初中英语八年级上册Module 1 Unit 2 Work and play同步练习2
— is in the museum with classmates．
—Sorry, I don't know. I think _________did it before class.
— No, _____ aren't.
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