has your friend ever been to America?
问题描述：
has your friend ever been to America?
has your friend ever been to america
yes,she----there last year.c
c.went b .has gone d.has been
为何选C？不是现在完成时吗
答
问：你朋友曾经去过美国吗?
答：有啊,她去年去的.
提问时不知答案,自然需要用完成时来体现“曾经”.
回答时很清楚知道,用简单过去时 went 表达去年发生的事.
Yes,she has (been there).是另一种回答,只说“是的,她曾经去过”这样的回答意味着并不确定什么时候去的.所以后面也不会有具体的时间.