We have aboy in our class.

问题描述:

We have aboy in our class.
A. English B. American C. Australian D. Japanese
问题应该是We have a _____boy in our class.

D
看冠词后的单词首字母是不是元音字母,是的话,用an,不是的话用a;
符合条件的只有D哦