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题型：单选题 题类：常考题 难易度：容易
牛津版（深圳•广州）初中英语九年级上册Module 1 Geniuses Unit 1 Wise men in history 综合复习
—Don't worry. I'm certain that he'll come.
—Yes, it is ____ book.
—They have made more than ten thousand by April this year.
—It's useful. What's more, it is not expensive.
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