have nothing to do but ……do 还是to do?

题目

have nothing to do but ……do 还是to do?
我说的是to do后面接do还是to do?（一楼六楼是不是误会了）给个统一意见吧……
三楼既然说是do,那么为什么例句中是slept？五楼例句中是doing？是都可以么？

答案

have nothing to do but do sth.
例如：I had nothing to do but slept all the time last Sunday.