The police were seeking more information to find out the rich merchant.
A. who was it that killed
B. who it was that killed
C. it was who killed
D. who was it killed
网友回答
A. who was it that killed
(答案→)B. who it was that killed
C. it was who killed
D. who was it killed
解析：试题分析：此处是强调句的特殊疑问句，其结构：特殊疑问词+be it that...,排除C,D,观察题干，find out后接一个宾语从句，从句应使用陈述语序，故选B