题干
--- Are you worried when your son often plays computer games?
--- Yes. I think playing too many computer games ______ on teenagers.
--- Yes. I think playing too many computer games ______ on teenagers.
A：have a good effect
B：has a good effect
C：has a bad effect
D：have a bad effect
答案(点此获取答案解析）
C
的值在（ ）
＋ 
=10