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He has been in touch with the people —— —— he went to Canada

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He has been in touch with the people —— —— he went to Canada last year
He has been in touch with the people —— —— he went to Canada
since
再问: 两个空
再答: ever since
再问: 介词+关系代词
再答: 不应该是定语从句,只能是时间状语从句。
再问: 可是题目是这样出的
再答: 那只能用with whom, “他已经和去年一起去加拿大的人取得了联系”