高中英语冠词1They are twins,so they are of ______ age.填入冠词 为什么选an,

高中英语冠词1They are twins,so they are of ______ age.填入冠词 为什么选an, They are twins,so they are（ They are twins,so they look( ) they are of an age.为何可以用an? They are -------They are twins. they are nearly of an age these doors are of a size 为什么要用一个o They are twins.They _______. they are ( ) a.the twins b.twins They are twins.对twins提问 They are the______(twins) books. They are twins.These are___books They are twins.（翻译）