短语a waste of time 后加的是 to do还是 doing?

短语a waste of time 后加的是 to do还是 doing? a waste of time后加TO DO还是DOING a waste of time waste修饰名词要加of吗 例如a waste of time 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 do. “Bai Feili”means（ ） A.a waste of time B.waste of time C.a waste of a time D.waste of a time 答题详细点. a waste of time 怎么造句? It is only a waste of time it was a waste of time and a waste of time 咋个造句 用“a waste of time”造句. 怎么用a waste of time造句 It's a waste of time exactly! A waste of time and effort I think watching TV is a waste of time .这里watch为什么要加ing? a waste of time后面是加 doing sth还是to do sth she thinks it a waste of time如何理解,为什么it后面不加is i don't think it waste of time to be with children all year round.这是改错题,后加 a