Be a waste of time 后加doing还是 to do .教参上都是doing,但Oxford初阶上用to

Be a waste of time 后加doing还是 to do .教参上都是doing,但Oxford初阶上用to a waste of time后加TO DO还是DOING 短语a waste of time 后加的是 to do还是 doing? it is a waste of time doing还是to do a waste of time后面是加 doing sth还是to do sth 请问,It is a waste of time 后该用to do 还是 doing waste time to do sth还是waste time doing sth? It is a waste of money 后用to do还是 doing Have a good time 后加do还是to-do 还是doing be a good time to do 还是doing be different from后加to do 还是doing make use of 后加to do 还是doing?