What problems at the lecture yesterday?
a) did you discuss
b) did you discussed
c) were you discussing
d) discussed you
С указанием правила.

Did you discuss

Объяснение:

вроде past simple?

What problems did you discuss at the lecture yesterday?

a) did you discuss

b) did you discussed

c) were you discussing

d) discussed you

С указанием правила.

yesterday - Past Simple