15'

A few years ago, I became quite unhappy at work for a number of reasons. The people I had to work with weren’t team players, nor were they particularly friendly. But the final straw for me was being passed over for promotion.
敲黑板
final/last straw 压垮骆驼的最后一根稻草；终于使人不堪忍受的最后一件事（或因素等）
pass sb over （考虑提职等时）跳过某人
promotion n. 晋升、升职