He -----（be）to the beach,so he knows it very well.填 has been to对吗,
问题描述：
He -----（be）to the beach,so he knows it very well.填 has been to对吗,
答
是的，过去完成时强调对现在的影响，因为他去过海滩，才有“对那里很熟悉”的结果。
答
对的，
答
是填 has been to，强调他去过，所以他对它非常了解。
答
填has been
答
has been to 对
理由：1 现在完成时,主语是单三
2 从后面给出的已知条件看,他之所以能了解,就是因为去过,所以用has been to.