1 ___ I finished the test, everybody had left
the classroom.
A By B By the time C Last time
2 When I saw her, I knew I ___ her before.
A met B had met C have met
3 By last Thursday, all the tickets ___.
A sell out B sold out C had sold out
4 When we arrived at the concert hall, the opera singer had already ___ the first aria.
A sung B sing C sang
5 I had never ridden a horse before we ___ to the countryside.
A had moved B moved C move
6 Jim had ___ celebrated Thanksgiving before he moved to the USA.
A never B ever C yet.