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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 378

He is really nervous. He ______ back and forth all the night waiting for the results.

A.had walked B.has been walking
C.walked D.is walking
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Heisreallynervous.Hebackandfor