I don’t know ( )they are going to do 填whaI don’t know ( )they are going to do 填what还是that?我感觉都可以.

I don’t know ( )they are going to do 填whaI don’t know ( )they are going to do 填what还是that?我感觉都可以.
I don’t know ( )they are going to do 填wha
I don’t know ( )they are going to do 填what还是that?我感觉都可以.

I don’t know ( )they are going to do 填whaI don’t know ( )they are going to do 填what还是that?我感觉都可以.
填what.do后面少宾语,所以这是一个宾语从句,what充当宾语.