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