They have a difficult time (to work /working) it on .到底用哪个?

They have a difficult time (to work /working) it on .到底用哪个? they tried to finsh the work in time though it was difficult he would have made it to work on time,but his car had a flat I find it difficult to finish the work on time.是什么句式 It's difficult for me to finish the work on time.改写I__some p It is difficult for ____ (they) to finish the work without a I have some problem ____ it out.A.working B.to work If you______to work on the job,you have to finish it on time The way to have a better tomorrow is to start working on it have a difficult time to do sth.还是have a difficult time doin I have all of my students working on a project...work 为什么要用i They came here to have a metting on time,____?A.didn't they