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We have seen this film (for或since) three times.

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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!
We have seen this film (for或since) three times.
for啊.since一般用在开始的时间点,since 2002,since that day,不可能用since three time,而for three time是已看了三次,不一定要拘泥于“since用于时间点,for用于一段时间”这样的话,理解大致使用情景,多读几遍,培养语感就很自然的不会错了