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The envelope-shaped paper bags common in the US 150 years ago were impractical for carrying goods. ________ because they were the only paper bags that could be mass-produced, these bags dominated the market. That all changed in the 1870s, when industrial designer Margaret Knight patented a machine to make flat-bottomed, foldable, paper bags.
Which choice completes the text with the most logical transition?
Difficulty: Easy
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