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题型：单词拼写（单句） 题类： 难易度：普通
【作业本】八年级下册英语A本Unit 4 Why don’t you talk to your parents第1课时
—No. She has lots of work to do.
— Sorry, I can't. Because they ____by my friend Lily.
—____, they keep the air cool and clean.
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