Link between opportunity and contact

I manually created opportunity(Campaigns - > Import opportunities - > Add these opportunities to database) by creating CSV file with records (Account name, Amount, Close date etc.). It was successfully imported, I checked it by search opportunities. Then I created link between contact and opportunity (Campaigns - > Import opportunities - > Link these opportunities to contacts) and it went also successfully (since I received an email saying: Opportunity to Contact Links:1). That means link was created, but is it possible to see it somehow? That it really was created, or prove it somehow?

Thanks.