I forget __________(是谁)told the interesting story.(be)就是空里必须有BE动词

问题描述:

I forget __________(是谁)told the interesting story.(be)
就是空里必须有BE动词

who was

支持who was 看成forget加从句

我觉得tell如果加上BE动词的话,就变成变动了,所以,这里加BE不适合吧,直接加WHO就好啊。而且told已经是过去式,如果加上BE,应该用原形才对吧。
或者你的横线画算地方了吧?

who

who was
这里可以理解为被动语态:我忘记谁被我告知这个有趣的故事了

being

who was