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题型：单选题 题类：常考题 难易度：普通
人教（PEP）2017-2018学年小学英语三年级下册Unit 1 Welcome back to school! 单元检测卷(2)（含听力音频）
—They are listening to music .
— .
A. Thank you.
B. You are welcome.
C. It's an egg.
D. Here you are.
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