答案：A

本题译文：事情结果怎么会这样：这两个人来在同一时间同一会议上作演讲？fall out 1)吵架，闹翻。本题中fall out意为happen, come about(发生),例如：As it fell out, they were able to sell their old car.(="They" didn't know if they could sell their old car, but at last they did sell it.)本题中it是形式主语，that引导主语从句。一般来说，不宜用take place作主语谓语，故不能入选。