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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1179

________you never plan to visit the polar bears in the North Pole or the penguins in the South Pole,now it is the proper time to start thinking about that.

A.Until B.Unless C.As long as D.Even if
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youneverplantovisitthepolarbea