【正确答案】 C

【答案解析】解析：句意：下了两个礼拜的雨，结果我们的假期全泡汤了。本题考查的是现在分词的用法。句中是现在分词短语作结果状语，completely ruining our holiday是一个现在分词短语作结果状语，rain的逻辑主语是前一句话。也就是说It has been raining for two weeks，completely ruining our holiday．=It has been raining for two weeks and it has completely ruined our holiday．故C正确。