He had been working very hard so he had no qualms about taking a few days off.

他一直辛勤工作，所以休息几天他觉得心安理得。

《牛津词典》

He had been working for a long time on the new game that would have the excitement of American football.

他已经为一款新游戏努力了很久，这款游戏将和美式足球一样刺激。

youdao

He had been working just opposite the towers.

他就在双塔对面的大楼里上班。

youdao

Darwin had been working on his theory for over twenty years when he published " On the Origin of Species."

VOA: special.2009.12.01

It turned out that he had been working for the Israeli intelligence service, Shin Bet.

CENTERFORSECURITYPOLICY: The Real Threat to Israeli Democracy

He had been working at the Abraham Ormerod Medical Practice in Todmorden at the time.

BBC: Shipman 'killed 215 patients'

Headley is alleged to have told prosecutors that he had been working with LeT since 2002.

BBC: US Mumbai attacks plotter given 35 years in prison