that引导状语从句i am now truly filled with happiness that i am a devoted friend and helper of the huamn race.这个句子当中的that引导的是同位语从句么?或者是原因状语从句?

问题描述:

that引导状语从句
i am now truly filled with happiness that i am a devoted friend and helper of the huamn race.这个句子当中的that引导的是同位语从句么?或者是原因状语从句?

同位语