The research should prove invaluable in the study of linguistics.A:useless B:pr

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问题 The research should prove invaluable in the study of linguistics.

选项 A:useless
B:practical
C:little
D:useful

答案D

解析本句意思:该项研究对于语言学的研究应极有价值。invaluable意思是“非常宝贵的,极为贵重的”,与useful(有用的)意思相近。useless无用的,无价值的;practical实际的,实践的; little小的,少的。
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