问题标题：
Shewilltelleverybodythateachofushasarole.inmakingtheriverandairclean.虚线处应该选哪一个,为什么?AtobeplayingBtohaveplayedCtobeplayedDtoplay
问题描述：
Shewilltelleverybodythateachofushasarole.inmakingtheriverandairclean.
虚线处应该选哪一个,为什么?
AtobeplayingBtohaveplayedCtobeplayedDtoplay
何敬文回答：
选D,短语toplayarolein表示起什么作用,这里的toplay做后置定语,修饰role
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