Have Tack gone to the library?Neither Jack nor his friends(are)there.They are at home now.请问括号里为什么用are?为什么不用have benn?

Have Tack gone to the library?Neither Jack nor his friends(are)there.They are at home now.请问括号里为什么用are?为什么不用have benn? have gone to=be have gone to ＆ have been to 区别 go to hospital,have a fever,peter,doctor,have a rest,have a cold ,tack some medicine 组成句子 have gone to 与 have been to ,have gone ,have been的区别是什么 I have gone away to come back . I think you have gone much to have gone to可以用什么代替 have gone to怎样与时间段用 I have already gone to Canada翻译 英语翻译为什么用 to have gone I have gone to Guangzhou.对Guangzhou 提问,Where have you gone?为什么不是Where have you gone to? have been to 和have gone to 有什么区别 have been to 跟have gone to区别 have been to与have gone to的区别 英语HAVE BEEN TO 和HAVE GONE TO 的用法 have been to,have gone to和want的区别 have gone to sp和have been to