As a member of one world each of us has a role to make the earth a better place.A. playi

问题补充：

As a member of one world, each of us has a role to make the earth a better place.

A. playing

B. play

C. played

D. to play

答案：

A. playing

B. play

C. played

(答案→)D. to play

解析：句意：作为世界的一员，我们每个人都要发挥作用，使地球成为一个更好的地方。“have sth. to do” 意为“有某事要做”，play a role:发挥作用；扮演一个角色。这里要跟 have sth. done 使某事、物被…, 和have sb. do,使/让某人做某事区分开。故D正确。