Improve or Improving?

[Tom]

Hello everybody

Could you please tell me about the right choice?

1- She contributed a great deal to -------------- the
standard of education in her country.

(improve-improving)

Thanks

Tom

[Yankee]

Hi Tom

contribute to something => to is a preposition

contribute to improving

If the meaning of to is the same as "in order to", then you can use improve:

contribute a great deal (of something) (in order) to improve

Amy