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题型：单选题 题类：常考题 难易度：普通
牛津版（深圳·广州）2018-2019学年初中英语八年级下册Module 4 Unit 8第6课时Integration
-- About two thousand. A number of them _____ from the countryside.
—Yes, it's interesting, _____difficult.
—Oh, I see. Your advice helps me a lot.
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