---What does your mother do?---She is . She works in a hospitalA. an actorB. a shop assist

问题补充：

---What does your mother do?

---She is . She works in a hospital

A. an actor

B. a shop assistant

C. a doctor

D. a policeman

答案：

A. an actor

B. a shop assistant

(答案→)C. a doctor

D. a policeman

解析：我的母亲在医院工作，那么选项中表示医生的单词doctor与此相符，故本题选C。