They differ from us ____ they are not willing to improve the
2个回答

这是一个同位语从句, 此处in that中的"that"是先行词 ,代指"they are not willing to improve the working conditions in such a famous company"的一大串内容,就好比"我的叔叔于勒"中的"我的叔叔"和"于勒"的关系,而which是不能够作为先行词使用的,也就是说如果选B就会缺少先行词,而光有引导词which.