◎ 题干
Since 1949, the people's living standard ____, causing a big ____ in population.

A. has been raised; rise
B. has been rose; raise
C. has raised; rise
D. has raised; rose
◎ 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“Since 1949, the people's living standard ____, causing a big ____ in population. [ ]A. has been raised; riseB. has been rose; raise C. has raised; rise D…”主要考查了你对  【名词】【现在完成时的被动语态】  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。