she married the old man because of what he had done for her .为什么用becauseof 不用 because,

问题描述:

she married the old man because of what he had done for her .
为什么用becauseof 不用 because,

because连接句子
because of因为在介词of的后面,所以连接名词
what he had done for her 是介词宾语从句
宾语从句属于名词性从句,所以你可以把它当成名词
表语从句,主语从句,同位语从句也都属于名词性从句