改错Prices have risen by 6 percents in the past year.
问题描述：
改错Prices have risen by 6 percents in the past year.
答
Prices have been risen by 6 percents in the past year.被动语态
改错Prices have risen by 6 percents in the past year.
Prices have been risen by 6 percents in the past year.被动语态