Question

I ... Mario for some time since he left Milan a few years ago.

Haven't seen
Don't see
Didn't see

Answer 1

I haven't seen for some time since he left Milan a few years ago.
Это present perfect.
Я не видел Марио в течение некоторого времени с тех пор как он уехал из Милана несколько лет назад.

Answer 2

I haven't Mario for some time since he left Milan a few years ago.

Время: Present Perfect