问题描述：
These foreigners have been to Tibet before.--Really?When__here?A.will they go
These foreigners have been to Tibet before.--Really?When__here?
A.will they go B.did they go C.have they gone
These foreigners have been to Tibet before.--Really?When__here?
A.will they go B.did they go C.have they gone
问题解答：
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