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

游客2025-03-17 31

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

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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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By1860,mostofthemachineryinusetodayhadbeendesignedinanearlyform.