◎ 题干
About one-fifth of workers in that factory _____ in the earthquake.

A. was killed
B. were killed
C. had been killed
D. have been killed
◎ 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“About one-fifth of workers in that factory _____ in the earthquake. [ ]A. was killed B. were killed C. had been killed D. have been killed …”主要考查了你对  【一般过去时的被动语态】【主谓一致】  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。