They are going to have the serviceman_______an electric fan in the office room tomorrow 选installIt was so cold that the travellers had the fire _______all the night选burningYou must have the paper ____by the end of this month选finishedhave sth一会儿加do,一会儿加doing,一会儿加done,怎么区别,还有什么用法,需要注意什么
问题描述：
They are going to have the serviceman_______an electric fan in the office room tomorrow
选install
It was so cold that the travellers had the fire _______all the night
选burning
You must have the paper ____by the end of this month
选finished
have sth一会儿加do,一会儿加doing,一会儿加done,怎么区别,还有什么用法,需要注意什么
答