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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1731

Taking a trip abroad is certainly good for old couples, but it remains ____ whether they will enjoy it.

A.to see B.to be seeing C.to have seen D.to be seen
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相关知识点

Takingatripabroadiscertainlygo