1 When he was working there he caught a serious illness from effects he still suffers.
问题描述：
1 When he was working there he caught a serious illness from effects he still suffers.
A.whichBthatCwhose Dwhat
为什么选C不选A?
答
whose 谁的（所有格）,定语从句中表示“某人的”或“某物的”都用whose引导.
whose efforts 是指 illness' efforts ：疾病的困扰.就是说 he still suffers from illness' efforts .句子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.