The word horsepower was first used two hundred years ago. James Watt had made the world’s first (11) used steam engine. He had n

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问题 The word horsepower was first used two hundred years ago. James Watt had made the world’s first (11) used steam engine. He had no way of telling people (12) how powerful it was, for at that time there were no units for measuring power. Watt decided to (13
  

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答案discovered

解析 意为“发现”,做谓语。
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