they were invited to an important ball ()the first time ()livesthey were invited to an important ball (for)the first time (in)livesA：for,in B：at,in C：on,for D：in,with为什么要选A而不选其他三个呢?
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前言They were invited to an important ball （）the first time （）lives.A：for,in B：at,in C：on,for D：in,with答案：A翻译：在他们的生命中,他们第一次被邀请参加一场很重要的球赛.解析：for the first time固定短语,表示作为第一次,首次；第一次.表示有生以来或一段时间内第一次做某事.in lives 在生命力/在生活中