2. 外语
  3. To protect his new invention，______(我叔叔申请了专利)．

To protect his new invention，______(我叔叔申请了专利)．

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问题 To protect his new invention，______(我叔叔申请了专利)．
选项
答案my uncle took out a patent on it
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大学英语六级

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