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题型：选词填空（单句） 题类：常考题 难易度：普通
仁爱科普版初中英语九年级下册Unit 6 Topic 2 Section B 同步练习
— Yes, I do.
—You are very lucky. There is a discount(折扣) on it today.
—It's a useful ________，so we must learn it well.
—I find it quite ______ I can find out the answer _______.
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