问题
选择题
He wrote a letter ______ he explained what had happened in the accident.
A.what
B.which
C.where
D.how
答案
答案:C
题目分析:句意:他写了一封信,在信里解释了事故当中所发生的事情。从结构判断是定语从句,从句中意思完整,不缺少成分,应该用关系副词,what、how不引导定语从句,故答案选C。