Not until 1798, when Eli Whitney came up with a new idea, guns had been made by skilled gunsmiths, one at a time.

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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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