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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 748

The retired professor, _____ in his new book in the past three years, hasn’t realized the decline in his health.

A.involved B.being involved C.having involved D.to be involved
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Theretiredprofessor,inhisnewbo