---do you do?-I am a doctor .A. HowB. WhyC. WhereD. What

问题补充：

---do you do? ---I am a doctor .

A. How

B. Why

C. Where

D. What

答案：

A. How

B. Why

C. Where

(答案→)D. What

解析：根据答语可知，询问的是职业。故用what do you do sth来提问。