he has ( )aunt in Nanjing and he goes to visit her once( )month

题目

he has ( )aunt in Nanjing and he goes to visit her once( )month
A.a, the B.an,the C.a,an D.an,a

答案

D.an,a
aunt 第一个音节元音发音,前面必须使用an.
once a month = 每月一次