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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 1262

___________in the study lost in thought for a long time, I suddenly realized that nothing in the world remains __________.

A.Having sit; unchanged B.To sit; unchanging
C.Sitting; unchanged D.Sitting; unchanging
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