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这句的suffered为什么要改为suffering?Formillionsofpeoplesufferedfromarthrities,itistheonlythingthatworks.这里的suffered为什么要改为suffering?

题目详情
这句的suffered为什么要改为suffering?
For millions of people suffered from arthrities,it is the only thing that works.这里的suffered为什么要改为suffering?
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答案和解析
因为suffer from这个词组在这里已经有宾语arthrities了,所以suffer from要用主动形式,你用suffered就变成过去分词表示被动了.