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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 1832

The valley was so deep that it had been ten seconds _________the stone feel off to the bottom.
A since          B before           C when             D until

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Thevalleywassodeepthatithadbee