look on 和look at

题目

look on 和look at
有一个改错题：原题是 I'll look at the computer.正确答案是把at 改为on.也就是 I'll look on the computer.我很费解啊.

答案

I'll look at the computer.
我会对着电脑看.或 （当电脑出现问题）我会检查一下你的那台机器.
I'll look on the computer.
我会在电脑上查.