I saw my friend yesterday .I[ ](not see)him for a long time

问题描述:

I saw my friend yesterday .I[ ](not see)him for a long time

hadn't seen (相对上文saw 而言的,过去的过去,用过去完成时)
、for a long time 前一般用现在完成时。那不一定。其它时态也能。 如:He waited there for a long time.He will stay there for a long time.