◎ 题干
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On average, there are 800 tornadoes in the U.S. each year, _______ about 80 deaths and 1,500 injuries.
A.causeB.causedC.to causeD.causing
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“.On average, there are 800 tornadoes in the U.S. each year, _______ about 80 deaths and 1,500 injuries.A.causeB.causedC.to causeD.causing…”主要考查了你对  【现在分词的被动式】【现在分词】【不定式的被动式】【过去分词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。