2. 职称英语
  3. Not until 1798, when Eli Whitney came up with a new idea, guns had been made by

Not until 1798, when Eli Whitney came up with a new idea, guns had been made by

游客2023-12-31  14
问题 Not until 1798, when Eli Whitney came up with a new idea, guns had been made by skilled gunsmiths, one at a time.
选项 A、To
B、In
C、Since
D、Until
答案 D
解析
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