Although they plant trees in this area every year, the tops of some hills are still ______. ( 章节：4 难度：3)
- A、blank
- B、hollow
- C、vacant
- D、bare
正确答案:D
答案解析:有
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Although they plant trees in this area every year, the tops of some hills are still ______. ( 章节：4 难度：3)
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