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题型：单选题 题类：常考题 难易度：普通
牛津深圳版英语七年级下册Unit 4 Save the trees 单元测试.
—No. I will
—We should do something to help the people there.
—You'd better ____ signs around the school to tell all the students about that.
—Sorry, I'll do it right away.
—I don't think so. She is old enough.
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