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-These farmers have been to the United States.

-Really?When ________ there?

[  ]

A.

will they go

B.

did they go

C.

do they go

D.

have they gone

答案:B
解析:

  现在完成时与一般过去时容易混淆,就是因为它们所表示的动作都发生在过去,但二者又有区别:一般过去时表示过去某个时间发生的事、存在的状态或经常发生的动作,说话的侧重点在于陈述一件过去的事情,与现在没有关系;现在完成时表示与现在有关系的、发生在过去的动作,它不与表示过去的时间状语(如yesterday,last week,a moment ago等)连用。故答案为B。


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