求It is three years since he worked in his office.解释下since

求It is three years since he worked in his office.解释下since It is three years since he smoked. It is three years since he worked there.如何翻译.为什么有一种翻译是：他不在那儿 It is years since his death.翻译下 It has been three hours since he left his office.把has been 换 t is three years since he joined the League?it is three year he worked here three years ago用since three years ago改写句子 It is five years since he smoked It is three years since he died.(同义句） He has ____ _____ for It's three years since he was married .的翻译 英语翻译it is already three years since he was a teacher是他不当教师已经 It is three years since he joined the army.为什么是用joined而不是用ha