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【题目】(2017·安庆四中月考)It ________ discovered ________ the 17th century.

A. wasn’t; until B. didn’t; until

C. didn’t; before D. doesn’t; till

【答案】A

【解析】句意:直到十七世纪它才被发现。根据语义可知,主语与谓语之间是被动关系,因而使用被动语态:be+动词的过去分词。discovereddiscover的过去分词。故选:A。

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