______the flood, the ship would have reached its destination on time.
【正确答案】 D
【答案解析】解析:虚拟语气句中,虚拟的条件由but for引导,表示对过去情况的假设,主句用would/should/could/might have+动词的过去分词,should只用于第一人称。所以本题应该选D。