Recently a survey has conducted to find out how many hours 改错急
问题描述：
Recently a survey has conducted to find out how many hours 改错
急
答
Recently a survey has conducted to find out how many hours
has改称was
答
has改为was 或者 has后面加been 看情形
中文：最近,一项调查正在进行,以找出有几个小时.