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591.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.
A.to have played
B.to play
C.to be played
D.to be playing
592.Don't use words,expressions,or phases _______ only to people with specific knowledge.
A.being known
B.having been known
C.to be known
D.known
