The decision has been made ___to them.

A, to know

B, known

选择B。请问为何不是be made to be known to them,使役动词make的被动还原不是应该加to吗?

有讲解说这里的known是adj做补语,不是非常了解这个讲解。

make sth + 形容词作宾补。没make sth be + 形容词结构。所以,被动语态为 sth is made +形容词作主补。没Sth is made to be+形容词如此的句子。