问题: 一、单项选择
9、--These farmers have been to the United States.
--Really?When_____there?
A.will they do
B.did they go
C.do they go
D.have they gone
解答:
9、--These farmers have been to the United States.
--Really?When___B__there?
A.will they do
B.did they go
C.do they go
D.have they gone
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