英语完成句子一道我们还没到达北京,水就用完了.______ we arrived in Beijing ,the water had ____ run out

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英语完成句子一道我们还没到达北京,水就用完了.______ we arrived in Beijing ,the water had ____ run out
英语完成句子一道
我们还没到达北京,水就用完了.
______ we arrived in Beijing ,the water had ____ run out

英语完成句子一道我们还没到达北京,水就用完了.______ we arrived in Beijing ,the water had ____ run out
填的是:Before been

__When____ we arrived in Beijing , the water had _been___ run out