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    volcanoes now for many years, I am still amazed at their beauty. A. Studying B. To study C. Having studied D. studied 【查看更多】

     

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     ____ 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

     

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