Greece and Australia are the only nations (attend) every summer olympic.
问题描述：
Greece and Australia are the only nations (attend) every summer olympic.
为什么attend要用to have attend,非谓语不是没有时态吗
答
Greece and Australia are the only nations是一个完整句子,后面紧跟attend原形自然就犯了语法的错误所以后面用to have attend做nations的后置定语,用完成时是为了强调已经参加了每一届夏季奥林匹克