问题补充:
——Do you know?
——He is a dentist.
A. where he is from
B. where is he from
C. what does his father do
D. what his father is
答案:
A. where he is from
B. where is he from
C. what does his father do
(答案→)D. what his father is
解析:英语宾语从句中一般为陈述语序。根据下文,他是一个牙医。可知上文问的是职业,选D,你知道他的父亲是什么(职业)吗?