• A．than more recent ones
• B．the killing efficiency for older eruptions
• C．has remained controversial
• D．Wignall’s calculations as acceptable
• E．has been known to us all
• F．his ideas

Older eruptions were more devastating ______.

【参考答案】

A more recent ones较后来的火山爆发。填入后生成的句子不仅在语法上是正确的并且跟文章第一句话的意思差不多......

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