---Playing computer games too long is bad for our eyes.---I you.A. agree on B. agree to C

问题补充：

---Playing computer games too long is bad for our eyes.

---I you.

A. agree on B. agree to C. agree with

答案：

解析：句意:-- 玩电脑游戏太长了对我们的眼睛是有害的。--我同意。agree on〔upon〕后的宾语主要是date, price, position, cease-fire, terms等。agree to后的宾语主要是arrangement, conditions, plan, proposals, suggestions, terms等。agree with作“适合”解时,主语多为表示气候、环境、食物等方面的名词,宾语多为人。这里后面跟的是人，根据句意故选C。