Question

When my grandmother was alive , we ________her and she ________chicken for us. *

a-used to visit used to cook
b-didn´t use to visit use to eat.
c-used to visit didn´t used to cook
d-used to visit didn´t used to eat.

Answer 1

Es la opción (a)

When my grandmother was alive, we used to visit her and she used to cook chicken for us.

Las demás opciones son gramaticalmente incorrectas: la forma negativa de used to es didn't use to, y en la afirmativa siempre se usa used.

Aparte no tienen mucha coherencia.