---are the student talking----?回答：a policeman.A.what with B.who to C.what at
问题描述：
---are the student talking----?回答：a policeman.A.what with B.who to C.what at
答
——（who）are the student talking（to）?
—— a policeman.
选B.回答是一个警察,问人要用who.