改错题 He became very impatient and phoned the post office to ask why it was no mail delivery.

题目

改错题 He became very impatient and phoned the post office to ask why it was no mail delivery.
改no mail delivery.

答案

it was no mail改为there is no mail delivered
意思是“没有信件”
delivered动词过去分词做后置定语“已发送的”
不知道楼主是否认同.如有异议,愿洗耳恭听.相互学习.