Seeing their son playing puter games all day, the parents don’t know it.
A. how to do
B. what to do
C. how to deal with
D. how to do with
网友回答
A. how to do
B. what to do
(答案→)C. how to deal with
D. how to do with
解析：deal with与how连用；do with与what连用。句意：看见儿子整天玩电脑，父母不知道如何处理这件事。故选C。