2. 外语
  3. Gunpowder was discovered in the twelfth century, but .

Gunpowder was discovered in the twelfth century, but .

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问题 Gunpowder was discovered in the twelfth century, but .
选项 A、man did not put it to use in war two hundred years later
B、until two centuries more it was used in war
C、not used in warfare until two hundred years later
D、in warfare did not use it two hundred years afterwards
答案C
解析
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