Having arrived at the earthquake-stricken area, we were led to ____ the homeless people lived. [ ]

A. what

B. in which

C. that

D. where

初发型心绞痛（）。

A.心绞痛的发作与劳累有关，其性质在1~3个月内无改变

B.心绞痛发作与体力活动无关，可出现短暂ST段抬高

C.近3个月内劳力诱发的心绞痛的频率和程度加重，对硝酸甘油的需求增加

D.既往无心绞痛或心肌梗死病史，近1~2个月内劳累时出现心绞痛

E.劳累和休息时均可出现心绞痛