【单选题】【消耗次数：1】
It was well known that Thomas Edison _____ the electric lamp.
①
discovered
②
invented
③
found
④
developed
参考答案：
复制
纠错
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①
international theme
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waste-land imagery
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local colorism
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【判断题】
Mark Twain, one of the greatest 19th century American writers, is well known for his international theme.
①
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①
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【单选题】
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①
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②
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③
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