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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