Kiewit Corporation Entry Level Project Engineer interview questions

I had two interviews with Kiewit. One at a career fair and a second at an office. The interview went well, and I was offered an internship. However, after about 2 months of no official written offer, I got an email saying they were revoking my offer. I had been in contact with the HR guy who was the head of recruiting, and he told me on multiple occasions that I would have a job as long as I was still interested, to which I said I was. Then with no warning I was dropped with a poor excuse. I was not impressed with this company and their business practices.