Then he _____ (work) there for about eight years.

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Thenhe_____(work)thereforabouteightyears.Thenhe_____(work)thereforabouteightyears.Thenhe_____(work)t

Then he _____ (work) there for about eight years.
Then he _____ (work) there for about eight years.

Then he _____ (work) there for about eight years.
The he has been working there for about eight years.
has been working是现在完成进行时,表示过去一直延续到现在的动作或状态.
他在那儿一直工作了8年

has been working
for加时间段是现在完成时并且是延续状态

has been working表示一种持续的状态