Question

When I ____________________ (finish) lunch, I called him

a) Had finishing

b) Have finished

c) Has finished

d) Had finishing

e) Had finished​

Answer 1

b) Have finished

Present Perfect, que indica ações que ainda estão acontecendo ou foram concluídas recentemente. 'have' + verbo no passado.

Answer 2

had finished = past perfect an action that happened before another