We have seen this film (for或since) three times.We have seen this film (for或since) three times.应该填什么?since用于时间点,for用于一段时间,那么three times 属于什么呢?好的一定给最佳!
问题描述：
We have seen this film (for或since) three times.
We have seen this film (for或since) three times.应该填什么?since用于时间点,for用于一段时间,那么three times 属于什么呢?好的一定给最佳!
答