No firm evidence had come to light___________ the men arrested were actually responsible for the accident.
A、as
B、that
C、what
D、which
【正确答案】：B
【题目解析】：该题考查的是同位语的用法。后面的从句的作用相当于主语evidence，因此用that引导后面的从句。同位语从句与定语从句的区别在于同位语从句中的引导词只能用that,且that不在从句中作成分，仅起到连接作用，类似的用法还有先行词是word，news等时后面也常接同位语从句。
