——These farmers have been to the United

These farmers have been to the United States
这些农夫去过美国."have been to" 指去过.
Really?When( )there?
Really （叹词）when 是询问时间会用的词,解 “何时”.there 要和go一起看,go there 解“去那裏”.
A will ...go是将来式,B did ...go 过去式,C do ...go 现在式 和 D 的have ...gone 完成式.
由于事情已发生,所以会用B,过去式.
有错请指出,