下面题选哪个,为什么

问题描述:

下面题选哪个,为什么
Is this the reason( )at the meeting for his carelessness in his work?A.he explained B.why he explained

答案为A .
the reason 作为先行词,在定语从句中做explain 的宾语,可以省略关系代词(that或which).选B的话,先行词应作状语.例如:Is this the reason why he was late?