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题型：单选题 题类：常考题 难易度：困难
牛津版（深圳•广州)2019-2020学年初中英语八年级上册Module 2 Unit 4 Invention第6课时 Integration
—Oh. You should put a sign "Keep your hands off" here.
—Yes, it's interesting, _____difficult.
— He went to the fridge and got a carton of milk out of it.
一 Oh, I'm sorry about that.
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