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She will tell us why she feels so strongly that each of us has a role ________ in making the earth a better place to live.


  1. A.
    to have played
  2. B.
    to play
  3. C.
    to be played
  4. D.
    to be playing
B
解析:
本题主要考查了动词不定式的时态与语态。从句意看,整个动作发生在将来,to play作a role的定语,其间存在着逻辑上的动宾关系,又与句中each of us存在着逻辑上的主谓关系,故动词不定式用主动形式表示被动意义,首先排除C项;
动词不定式to play意指将来的动作,to have played意指已经完成的动作,to be playing则强调动词不定式动作正在发生。
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