这句话对不对？啥意思？

不对
already和完成时搭配
应该是Our classroom has cleaned already.

我们的教室已经被打扫过了

不对啊,ALREADY应该用在完成式
应该是
Our classroom has been cleaned already

不对,应改为Our classroom has been cleaned.

不对捏 ~~应该 是过去完成时的 被动语态
Our classroom has been cleaned already