volcanoes for many years, I am still amazed at their beauty as well as their potential to cause grea...
2022-08-28 14:14:49 161次 2019年3月普通高等学校全国招生考试 天津卷英语 Word 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
volcanoes for many years, I am still amazed at their beauty as well as their potential to cause great damage.
A. To study B. Studying
C. Having studied D. Studied
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