This is the text: La casa (a. estar) en lo alto de un cerro bajo. Desde allí (b. verse) el río y el campo de maíz maduro con las flores del frijol que siempre (c. prometer) una buena cosecha.

I need to fill in the blank "b." with the correct conjugation. We are talking about imperfect tense. I am also told this:

(hint: "el río y el campo" are the subjects of this sentence)

I have tried all the conjugations I could find/think of.
Thank you.