they are of an age.为何可以用an?

they are of an age.为何可以用an? they are nearly of an age these doors are of a size 为什么要用一个o They were of an age.动词为什么用过去时? 高中英语冠词1They are twins,so they are of ______ age.填入冠词 为什么选an, They were of an age.这里为什么用of什么用 They were the same age.和They were of an age.哪对? you graduates are coming of age in an amazing time of age,of the age,of an age 用法是什么 Although they are brothers,they are the___opposite of one an 英语翻译If they are educated art and music at an early age,they Is it an orange or an apple?为何不是Are they? 请问：We are living in an age （ ） we have a lot of things to le