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题型：单选题 题类：常考题 难易度：普通
外研版（三年级起点）2017-2018学年小学英语五年级下册Module 6 Unit 2 She visited the Tianchi Lake. 课后作业
on, in, under, off, at, next to, to
—Sorry, Mum. I have to do my homework at home.
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