Though the first letter is ( ) u in the letter useful, we should say ( ) useful book.

分类: 作业答案 • 2022-01-09 18:03:45

问题描述：

Though the first letter is ( ) u in the letter useful, we should say ( ) useful book.
A: \ , a
B: a ,a
C: a, an
D: an, an

答