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问题: 一、单项选择

17、My parents_____Shandong for ten years.
A.have been in
B.have been to
C.have gone to
D.have been

解答:

My parents___A__Shandong for ten years.
A.have been in
B.have been to
C.have gone to
D.have been
是现在完成时的用法,后面有for,表示时间段