My mother is English teacher in middle school.A. a anB. an anC. an aD. a a

问题补充：

My mother is English teacher in middle school.

A. a, an

B. an, an

C. an, a

D. a, a

答案：

A. a, an

B. an, an

(答案→)C. an, a

D. a, a

解析：句意：我的母亲在一所中学是一名英语教师。因为English是元音因素开头的单词，故用不定冠词an来修饰。a middle school一所中学。故选C。