◎ 题干
Welcome to the Science Museum, everyone! This stone axe _____ in South Africa and experts can't be exactly sure about its use.

A. had been found
B. was found
C. has been found
D. would be found
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Welcome to the Science Museum, everyone! This stone axe _____ in South Africa and experts can't be exactly sure about its use. [ ]A. had been foundB. was fou…”主要考查了你对  【一般过去时的被动语态】  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。