volcanoes for many years, I am still amazed at their beauty as well as their

题干

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

上一题下一题 0.4难度单项选择更新时间:2019-04-04 12:44:44

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