◎ 题干
—These farmers have been to the United States. 
—Really? When _______ there?
[     ]
A. have they gone
B. did they go
C. will they go
D. do they go
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—These farmers have been to the United States.—Really? When _______ there? [ ]A. have they gone B. did they go C. will they go D. do they go …”主要考查了你对  【一般过去时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。