The gold loop discovered in the ancient tomb _____ to be _____ in studying the history of the Jin Dynasty.A.was turned out; valuableB.proved; of great valueC.was proved; of great valuableD.proved; much valuable
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B解析试题分析：考查prove和of+n相当于形容词的用法，proved to be意思“证明是”， of great value= valuable，句子意思“在古墓被发现的金环证明是在研究晋朝很有价值”，所以选B考点：考查prove和of+n相当于形容词的用法点评：句子The gold loop discovered in the ancient tomb…中单词discovered，过去分词做后置定语，表示被发现。动名词也可以做后置定语，表示主动。