问题补充：
---What does your father do? --- He is .
A. a teacher
B. old
C. watching TV
Din a hospital
答案：
(答案→)A. a teacher
B. old
C. watching TV
D. in a hospital
解析：本题的问句为What does your father do？，可知答语为表示某人职业的词，其中A为教师，符合题意，而B为形容词，old不能回答职业，C为现在分词，也不能回答问句，D 为介词短语，不能回答问句内容。故选A
