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”意思, 所以最佳答案是B。

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职称英语卫生类C级

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