Next summer after taking the national entrance examination,________ I' ll stay in Hainan Island, will surely be an exciting holiday.
考查时间状语从句。句子主干为： Next summer will surely be an exciting holiday ．中间部分为 when 引导的时间状语从句。句意为 “ 参加完高考以后，我将留在海南岛，那个夏天，将是一个令人兴奋的假期 ” 。