Some passers-by witnessed the car accident five passengers were killed, a baby included.
A. that
B. which
C. in which
D. in that
网友回答
A. that
B. which
(答案→)C. in which
D. in that
解析：考查定语从句。定语从句的先行词是the car accident,后面的短语从句的句子很完整，故使用关系副词where,在定语从句中关系副词=介词+关系代词which。本题指在事故中，故使用介词In；句意：一些路过的人目睹了这起事故，在事故中五名乘客死亡，包括一个孩子。故C正确。