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一个英语从句的问题Some beaches are frequently contaminated by untreat

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一个英语从句的问题
Some beaches are frequently contaminated by untreated sewage that flows into the ocean,which can last for several days
这个里的which,用的对吗
可不可以指代前面污染的这件事?
我就是想说
which可不可以指代污染持续很长时间
非限定性定语从句的指代问题
一个英语从句的问题Some beaches are frequently contaminated by untreat
不可以这样.根据一般现在时的特点,“经常做某事”本身即是永久持续的,故不可last for some time.要表达你的意思,可以改成下面这样:
Some beaches are frequently contaminated for several days by untreated sewage that flows into the ocean.