题目内容：
Although they plant trees in this area every year, the tops of some hills are still _______.A) blank B) hollow C) vacant D) bare
参考答案：
选择题：Although they plant trees in this area every ?
- 题目分类：语言/文学
- 题目类型：选择题
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._______ his sister, Jack is quiet and does ?
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This crop has similar qualities to the ?
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