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的意思是“深入透彻的研究”，故可以用careful research来替代。 basic的意思是“基础”， major的意思是“主要的”，social的意思是“社会的”。

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