I am studying for the TOEFL iBT and I have this sample introduction to an independent writing section:

>Although some people prefer to work alone, I believe it is much better to work in teams. The benefits for working in teams vastly exceed the convenience of working alone. In my opinion, there are two main advantages **to working** in teams over working alone.

My question: why does *working* come after *to*? I have been taught that after *to* we must use the "zero verb" or "general" form of the verb.