i am ten.my brother is thirteen.my sister is fifteen.用比较级合并为一句my sister is young,but my brother is___and i am__ __.

问题描述:

i am ten.my brother is thirteen.my sister is fifteen.用比较级合并为一句
my sister is young,but my brother is___and i am__ __.

Younger更小
The youngest最小的

my sister is young,but my brother is【younger】and i am 【the】【youngest】