the solution to的to是什么词性

to是介词词性，例如：

1、The solution to last week'；s quiz is on page 81.上星期测验的答案在第81页。

2、The solution to the problem lies in persuasion rather than coercion.解决这种问题要靠疏导，而不能靠压服。

3、Most agree that the solution is to push doctors to accept fixed payments to care for a particular illness or for a patient'；s needs over a year.大多数人同意，解决办法就是让医生接受以固定的费用在一年之内治疗特定疾病或特定患者。