Although they plant trees in this area every year, the tops of some hills are still ______. ( 章节：4 难度：3)_做题室

单项选择题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：
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