can they
见下面的两个英国网页（但打开比较慢）,第一个里面有That way nobody can complain - can they?
第二个里面有Surely nobody can beat that, can they?
www.tes.co.uk/section/staffroom/thread.aspx?story_id=2577055&path=/primary/&threadPage=1
football.guardian.co.uk/news/theknowledge/0,9204,977095,00.html