试题 试卷
题型：单选题 题类：常考题 难易度：困难
北京版小学英语三年级下册Unit 5 单元测试（含完整音频）
A. Yes, it is.
B. No, it isn't. The library is on the first floor.
C. It's on the second floor.
D. No, it isn't. The teachers' office is next to the library.
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