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

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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。