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

题干

____ volcanoes now for many years, I am still amazed at their beauty as well as their potential to cause great damage.

A．Studied

B．To study

C．Having studied

D．Studying

上一题下一题 0.64难度单项选择更新时间:2013-06-21 08:33:13

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