It is a waste of time doing this这里为什么用doing而不用do?为什么?

It is only a waste of time is,talking with,of,her,waste,time ,a,it, 是It is a waste of time to play computer games 还是Playing computer games is a waste of time they think it is a waste of time to do it now能不能改成they think it a waste of time to do it now为什么 What ___ time it is to listen to a speech having nothing to do with you.需详解 A waste B wastesC a waste of D waste for waste——that is a waste of money it is a waste of time to do 这个句子it is a waste of time to 》》》 怎么写成 爱上她纯属浪费时间 it is waste of time to fall in love with 是不是少了什么陈分? What ___ time it is to listen to a speech having nothing to do with youA waste B wastesC a waste of D waste for she thinks it a waste of time如何理解,为什么it后面不加is it was a waste of time and It's a waste of time exactly! It is likely to end up being a waste of time and money 有it is a waste of time doing sth 这种用法吗?如题. it is a waste of time,really 这句怎么讲解? It is a waste of time doing this这里为什么用doing而不用do?为什么? It is a waste of time ( ) that againA.say B.said C.to say D.saying it is a waste of time to play computer games day and night 适当形式填空Stop doing that!It is a waste of time and ____________________(affort).