They believe spirit stays with the body for 3 days, someone always stays with the dead person.
A. during this time
B. during which
C. so when
D. during when
网友回答
A. during this time
(答案→)B. during which
C. so when
D. during when
解析：考查定语从句。句中先行词为3 days，during which即during 3 days在三天期间，选B。