She will tell everybody that each of us has a role .in making the river and air clean.虚线处应该选哪一个,为什么?A to be playing B to have played C to be played D to play
问题描述：
She will tell everybody that each of us has a role .in making the river and air clean.
虚线处应该选哪一个,为什么?
A to be playing B to have played C to be played D to play
答
选d，为have sth to do句型，每个人都有事情去做
答
D have +带to或不带to的不定式
答
选D,短语to play a role in 表示起什么作用,这里的to play做后置定语,修饰role