1 ever 一般只用在“一般疑问句”中.在“特殊疑问句”ever一般是不存在的.
2 答案是 have -- - visited
3 which place在你的语境里面应该改写成what place(s).which往往出现在有选择的范围里面.根据你的句子,应该说what place(s),因为没有出现可供选择的范围.
4 What place in Beijing have you been to
==What place in Beijing have you visited
--------句子是你自编的吗?卷子是这么出的 谢谢你不过总要写一个吧 我写了visitedto哦，是 visited。