2. 外语
  3. _____(集中精力于)his scientific research ,he had no time left for recreational activities.

_____(集中精力于)his scientific research ,he had no time left for recreational activities.

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问题 _____(集中精力于)his scientific research ,he had no time left for recreational activities.
选项
答案Absorbed in
解析 be absorbed in意思是“集中精力于，埋头于”，本题中过去分词短语作原因状语。
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大学英语四级

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