◎ 题干
The bridge was built in memory of the adventurer who was believed ______ the valley.
A.to have been discoveredB.to discover
C.to have discoveredD.having been discovered
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“The bridge was built in memory of the adventurer who was believed ______ the valley.A.to have been discoveredB.to discoverC.to have discoveredD.having been disc…”主要考查了你对  【现在分词的被动式】【现在分词】【不定式的被动式】【过去分词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。