Question

The Aztecs ____________________built pyramids.
A.
were able to


B.
Am able to


C.
was able to


D.
be able to

Answer 1

Let's do it...

The aztecs were able to built pyramids.

Es la opción (A) debido a que nos referimos al sujeto (They) y el auxiliar Were básicamente corresponde a ese sujeto.

Never Give Up!

Answer 2

La respuesta es were able to