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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 743

The scientist knew nothing about the matter, because he was always _________ himself in his study.

A.burying B.devoting C.focusing D.concentrating
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Thescientistknewnothingaboutth