用a或an的常见词有哪些
问题描述：
用a或an的常见词有哪些
答
a useful book,a university,a Enropean country an ugly duck,an umbrella,an hour ,an honor,an honest man
用a或an的常见词有哪些
a useful book,a university,a Enropean country an ugly duck,an umbrella,an hour ,an honor,an honest man