scince此句是现在完成时（have/has+动词过去分词）,后面加时间的话用for或scince.区别在,for后面加一段时间,而scince后面加过去的时间.因为这里有这个ago表示过去的词,所以用scince.也可以改为：He hasn't seen his ...
2 He hasn’t seen his family _____ three years ago.
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