请教句子成分的划分,where的用法,还有from与后面的2个through有什么关系吗?还有and?the level of discrimination has varied enormously in the history of human societies,from genocide where ethnics are killed off through expilsion and,when these extremenforms of discrimination are not possible,through segregation in a narrow range of jobs. 英语
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【答案】 the level of discrimination是主语,谓语是has varied,where引导的是定语从句.