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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 1071

We plan to reach the North Pole in mid-July, and by then we _______ for six weeks.

A.are walking B.have been walking
C.will be walking D.will have been walking
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WeplantoreachtheNorthPoleinmid