you have been in Neijiang very long?Yeah _____my parents came here.A for B when C since 为什么呢

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youhavebeeninNeijiangverylong?Yeah_____myparentscamehere.AforBwhenCsince为什么呢youhavebeeninNeijiangver

you have been in Neijiang very long?Yeah _____my parents came here.A for B when C since 为什么呢
you have been in Neijiang very long?
Yeah _____my parents came here.
A for B when C since 为什么呢

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.

have been in 是现在完成时,而且表示延续性,如果for作为连词是因为的意思,when表示短暂性的,所以选c.

hhave been是现在进行时 现在进行时跟一段时间连用 since my parents came here意思是从我父母来这儿 是一段时间 所以选since

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