由工业废气所造成的空气污染已经被研究好多年了,但是仅仅直到最近噪声污染才被人们所熟知.
这里主语是Air pollution,后面的caused by industrial fumes 只是后置定语修饰Air pollution,主谓要一致,所以用has been .
希望对你有所帮助.
英语翻译Air pollution caused by industrial fumes has been studie
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