关于play an important role

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关于play an important role
both A and B　plays an important role in today's society.总感觉有点怪,both后有A 和 B 后面是play an!important role.不知道这种情况怎么处理,难道有play important roles?感觉略怪

oth A and B　play an important role是对的,play的单复数形式由它前面的主语决定,由于前面是both A and B所以要用复数
再问：　重点是后面的play an important role 还是play important roles 还是有其他的解决办法
再答： play important roles 是固定用法，是要问这个吗？

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