这个句子时态对不对 自己写的
问题描述：
这个句子时态对不对 自己写的
the 21st century have been bringing both development and stress to us.As a result,people the human became more solitary and more than ten million even suffered from certain mental illness.
答
the 21st century has been bringing both development and stress to us.As a result,the human become more solitary and more than ten million people even suffer from a certain mental illness.
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