has been opened和has been open的区别.

问题描述:

has been opened和has been open的区别.
题目是这样的-
原题:The library opened in 1998.(转换同义句)
The library has been opened since 1998.(疑问:library的话应该是主动的,因为原题是主动的,怎么答案上就成了被动的?而且有since的话应该用可持续的动词,我认为应用has been open.把open当形容词来用.)
应该是什么?

我觉得用open做形容词,指的是开门营业的意思,指一天天的开门,
open做动词,表示开办,创立的意思.
按文中意思,显然是强调创立开办.