问题补充:
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
答案:
(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。