问题
选择题
— These foreigners have been to Tibet before.
— Really? When _____ there?[ ]
A. will they go
B. did they go
C. have they gone
答案
答案：B
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— These foreigners have been to Tibet before.
— Really? When _____ there?[ ]
A. will they go
B. did they go
C. have they gone
答案：B