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

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问题 The book took ten years of thorough research.

选项 A:basic
B:careful
C:social
D:major

答案B

解析本句意思:这本书经过了10年的细心研究。thorough在此意为“细心的,认真的”,与 careful(细心的)同意。basic基本的;social社会的;major主要的。
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