一个关于现在完成时选择题?A:These farmer have been to the United States. B:Really? When _____ there? A did they go B have they

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一个关于现在完成时选择题?A:These farmer have been to the United States. B:Really? When _____ there? A did they go B have they
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一个关于现在完成时选择题?A:These farmer have been to the United States. B:Really? When _____ there? A did they go B have they
一个关于现在完成时选择题?
A:These farmer have been to the United States.
B:Really? When _____ there?
A did they go B have they

一个关于现在完成时选择题?A:These farmer have been to the United States. B:Really? When _____ there? A did they go B have they
A:These farmers have been to the United States.
B:Really? When _____ there?
A did they go B have they been
楼主的问题是：前面一句用现在完成时,后面一句为什么不用现在完成时呢?
答：现在完成时主要有两个用法：短暂性用法和延续性用法.这里是第一种用法.
have been to sp. 表示“去过某地”.
要注意的是：现在完成时与“现在”有关,所以句子中不能有明确表示过去的时间状语.
回答者已经知道这些农民去过美国了.接下来他对他们什么时候去的问题干兴趣.所以问了个When的问题,这个when就是指过去的时间,在句子中作时间状语的.根据现在完成时的功能,不能用在这里,所以选A,意为：他们什么时候去的那儿?

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