Zhai Min, 24, a software engineer at Kingdee International Software Group in Shenzhen, found that 3 elderly workers liked to complain about everything, from extended working hours to cheap hotels on business trips.
老师,这里的extended, 如何是ed的形式,from是介词,难道是形容词修饰hours?
extended在这里是过去分词作定语修饰working hours,from...to表示“从...到...”,即“从延长的工作时间到出差时住实惠的酒店”