The two researchers originally set out to study the zebras in Africa and discovered a new species of...
2022-11-13 18:47:04 186次 2014-2015学年陕西西安庆安高级中学高二下期末英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
The two researchers originally set out to study the zebras in Africa and discovered a new species of tiger ______.
A. by chance B. in addition
C. by nature D. in need
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