on children's day,boys and girls are all (dressed) in their dest clothes.为什么要加 ed?
问题描述：
on children's day,boys and girls are all (dressed) in their dest clothes.为什么要加 ed?
答
在儿童节,男孩和女孩们都穿上最好看的衣服
这里dressed相当于形容词,be dressed in 固定表达“穿着”.