英语SAT语法题(Identifying Sentence Errors)题目是这样：Air pollution caused by industrial fumes has been studied for years, but only recently has the harmful effects of noise pollution became known.我的英语老师说是has用错了.应
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英语SAT语法题(Identifying Sentence Errors)题目是这样：Air pollution caused by industrial fumes has been studied for years, but only recently has the harmful effects of noise pollution became known.我的英语老师说是has用错了.应
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