——the farms have been to the US.___really?when there?a.did they go b.have they gone

问题描述:

——the farms have been to the US.___really?when there?a.did they go b.have they gone

选A.那些农民已经去过美国了.真的吗?他们什麽时候去的?
从第一句看出他们去过了,这是已经完成的事情,那么他们“去”美国这个动作是发生的过去的.在过去的时间下应该用过去式.