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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1910

All Mrs Smith's efforts to tidy the room were _____ because her grandson soon made a mess of it again.

A.at all costs B.at random
C.in vain D.in return
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AllMrsSmithseffortstotidythero