my mum lost her life in a car accident ____her death

问题描述:

my mum lost her life in a car accident ____her death
A after B before C when D as

D
其他项感觉意思都不对!
when后面应该接一从句;
after、before句意不通.
个人看法,完整的句子是这样的one years ago , my mum lost her life in a car accident ____her death ,i was in great sadness.横线前面有逗号或句号没?没那应该是选D吧!