The book took ten years of thorough research.A careful B basic C social D major

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问题 The book took ten years of thorough research.

选项 A careful
B basic
C social
D major

答案A

解析thorough的意思是“彻底的、透彻的”，thorough research则是“深入透彻的研究”，故可以用careful research来替代。basic基础的，m$or主要的，social社会的。

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