Assisting and engaging people has/have

[Pizzas]

Hello,

Can you give me some feedback on which form of the verb I should be using?

Assisting and engaging people from all walks of life has/have strengthened my customer service skills.

I think that I should use has, but I'm conflicted.

Thoughts?

 

[SwissPete]

I would go with 'has', because 'assisting and engaging' is really one activity.

 

[kw10]

I would say "has" too.