The book took ten years of thorough rese

昕玥2019-12-17 4

问题 The book took ten years of thorough research.

选项 A:basicB:socialC:majorD:careful

答案D

解析本句意思：这本书需要十年十分仔细的研究。thorou沙意思为“（人）十分仔细”,careful 意为“仔细的，认真的”，两词的意思相同。

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