______I been there, I could have explained it.

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问题 ______I been there, I could have explained it.

选项 A、Have
B、Should
C、Would
D、Had

答案D

解析本题考查虚拟语气。虚拟条件句中有were，had，should，could时，可省略if，而把were，had，should，could放在主语前，用倒装结构。

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