I renounced U.S. citizenship last year. Do I must report tax with dual status?

I renounced U.S. citizenship last year.

Do I must report tax with dual status for the last year?

Or is it ok to report tax for the full year using Form 1040? 

I found that filing taxes with dual status is very difficult.

So, if possible, I would like to file Form 1040 for the entire year. 

Please let me know if there are any legal issues with this.