问题
选择题
As we all know, computer games with fights have bad effects _______the teens.
A.in
B.at
C.for
D.on
答案
答案:D
介词辨析.in在里面;at在一点;for为了;on在一面;句意:众所周知,带有战斗的电脑游戏对于青少年有很不好的影响.have effects on sth,表示对…有影响。故选D