问题补充：
--is your father ? -- He is watching TV.
A. What , doing
B. What ,do
C. How , doing
D. How , do
答案：
(答案→)A. What , doing
B. What ,do
C. How , doing
D. How , do
解析：句意：--你的父亲正在做什么？--他正在看电视。分析答语，运用现在进行时回答，因此问题也应是用现在进行时提问，what is your father doing? 故选A
