They have made up their mind to stay in Britain.They have ma
They have made up their mind to stay in Britain.They have made up their minds to stay in Britain.
They have made up their mind to stay in Britain.
They have made up their minds to stay in Britain.这两句那句对,我觉得是第一句,因为make up one's mind是固定搭配,这里面mind应该是不可数,