2. 外语
  3. Engineers had a better choice of material, ______________ (当新发明被投入使用以后).

Engineers had a better choice of material, ______________ (当新发明被投入使用以后).

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问题 Engineers had a better choice of material, ______________ (当新发明被投入使用以后).
选项
答案after the new invention was put into use/practice/operation
解析
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大学英语六级

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