真题练习

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

答案解析

591.答案是B;短语play a role/part in (doing)sth.在（干）某事中起作用。此题中to play作定语修饰前面的a role。
592.答案是D;此处known作定语修饰前面的名词。Be known to sb.为…所知。