-These farmers have been to the United States.

-Really?When ________ there?


  1. A.
    will they go
  2. B.
    did they go
  3. C.
    do they go
  4. D.
    have they gone
B
問句是問他們什么時候去那里的,“去”的動詞發(fā)生在過去,故本句應(yīng)用一般過去時.
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