问题
选择题
She will tell us why she feels so strong that each of us has a role________in making the earth a better place to live in.
A．to have played
B．to play
C．to be played
D．to be playing
答案
答案：B
主要考查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，又与句中的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。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进行。
答案： B