2. 外语
  3. By 1860, most of the machinery in use today had been designed in an early form. (Passage 3)

By 1860, most of the machinery in use today had been designed in an early form. (Passage 3)

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问题 By 1860, most of the machinery in use today had been designed in an early form. (Passage 3)
选项
答案到1860年，现在使用的大多数机器已经有了雏形。
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成人本科学位英语

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