题目内容：

定语从句 When he was working there he caught a serious illness from ____efforts he still suffers
A which B that C whose D what
这句话的意思是?为什么答案是C? 麻烦分别解释一下.

优质解答

whose efforts 是这illness' efforts.
是说他在那里工作的时候染上了严重的疾病,他现在还在受到这个疾病的困扰.