what's wrong —— your computer?A on B behind C with

问题描述:

what's wrong —— your computer?A on B behind C with

选C,因为 wrong with sth. 是固定搭配,意为某物有问题,例:
There is something wrong with the machine. 这台机器有点问题.
What`s wrong with your watch?你的表怎么了?