一个英文句子语法,修改和解释.

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/11/12 19:49:03

一个英文句子语法,修改和解释.
Air pollution caused by industrial fumes has been studied for years, but only recently has the harmful effects of noise pollution became known.
这个是错的,请问怎么改.很讲解一下.
那第一句的那个has不改为have?

Air pollution caused by industrial fumes has been studied for years,but only recently have the harmful effects of noise pollution become known.
两个问题：
后面倒装句主语为effects,所以用复数谓语动词have.
become的过去分词是become.
第一个不用改.
因为主语是air pollution
caused by indurstrial fumes 只是做定语

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