Question

He wrote a letter ______ he explained what had happened in the accident.

A．what

B．which

C．where

D．how

Answer 1

C

    
试题分析: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。