Intermediate German (Part 3): the past perfect continuous (Ex. I HAD BEEN working for 3 weeks when I got my promotion...1st event starts and ends in the past)

Question

the past perfect continuous (Ex. I HAD BEEN working for 3 weeks when I got my promotion...1st event starts and ends in the past)

Andy Haut · Accepted Answer

das Plusquamperfekt in der Verlaufsform

How do you say The past perfect continuous (Ex. I HAD BEEN working for 3 weeks when I got my promotion...1st event starts and ends in the past) in German?