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

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问题 The book took ten years of thorough research.

选项 A:basic
B:social
C:major
D: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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