The idea he didn’t have to stop at the red light at night caused the traffic accident.
A. that
B. which
C. what
D. why
网友回答
(答案→)A. that
B. which
C. what
D. why
解析：考查同位语从句：同位词是the idea，后面是对idea的内容进行说明，是同位语从句，用that连接，that不做成分，也不能省略。句意：他在夜里不用等红灯的想法导致了交通事故。选A。