How long----------your uncle---------【be】in the city has been Why

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Howlong----------youruncle---------【be】inthecityhasbeenWhyHowlong----------youruncle---------【be】int

How long----------your uncle---------【be】in the city has been Why
How long----------your uncle---------【be】in the city has been Why

How long----------your uncle---------【be】in the city has been Why
How long用完成时（have been）
your uncle 用单数（has been）
have been in +sp 表示一直在某地
所以How long has your uncle been in the city
你的叔叔在这个城市待多久了（现在还在这个城市）
不明白的再问哟,请及时采纳,多谢!

你的叔叔在这个城市待多久了（现在还在这个城市）

这是现在完成时结构，表示这种状态持续的时间有多长？

现在完成时，主语your uncle 所以用has，持续性动词been

have been in +某地表示一直在某地，而且how long 用现在完成时。

have been in +某地表示一直在某地
前面有how long 用现在完成时合适

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