The reason why he was late was the rainstorm.He was late ____ there was a rainstorm.改为同义句

问题描述:

The reason why he was late was the rainstorm.He was late ____ there was a rainstorm.改为同义句

这里一般用because
as 和since的语气比较弱.for的语气更弱.这三个单词都是一般说是显而易见的.since有时还会翻译成既然……的意思,所以一般用because.