求英语老师达人们为在下详解.We should take good care of ___________.1,young and old 2,the young and old 3,the young and the old 4,young and the old .但是为什么呢?不解,求详解.为什么其他不可以?
问题描述：
求英语老师达人们为在下详解.
We should take good care of ___________.1,young and old 2,the young and old 3,the young and the old 4,young and the old .
但是为什么呢?不解,求详解.为什么其他不可以?
答