Question

qual é o certo 'that was filmed or that were filmed' e pq

Answer 1

that was the filmed, pois "filmed" está fazendo o papel do IT, dessa forma, cm It é 3° pessoa do singular, usamos o was

Answer 2

O certo é "That was filmed".

That = It

I - was

You - were

She - was

He - was

IT - WAS

We - were

You - were

They - were

Espero ter ajudado!