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you have been in Neijiang very long?

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you have been in Neijiang very long?
Yeah _____my parents came here.
A for B when C since 为什么呢
have been in 是现在完成时,而且表示延续性,如果for作为连词要用一段时间,而since是从...起的意思,my parents came here一般过去时句子表示时间,所以选c.