Sysco has been waiting nearly a year since it announced plans to buy US Foods. And it looks like the food distributor will have to wait a little longer. Houston-based Sysco (SYY) said Monday that it expects the $3.5 billion deal to close next year, since the Federal Trade Commission is still reviewing it. Sysco and US Foods, which is owned by private equity companies, are the only two food distributors with national reach.