The book took ten years of thorough research.

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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

解析本题难度不大，干扰项干扰不大，是送分题，thorough的引申意义指“认真的，精心的”，careful是“认真的”的意思，所以最佳答案是B。

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