问题描述：
We have __many difficulties these years.
A.gone over B.gone on C.gone out D.gone through
选哪一个呀,能详细讲解一下吗?谢谢!
A.gone over B.gone on C.gone out D.gone through
选哪一个呀,能详细讲解一下吗?谢谢!
问题解答：
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