The Smiths _____ ( work) at this school since 1998.

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The Smiths _____ ( work) at this school since 1998.
The Smiths _____ ( work) at this school since 1998.

The Smiths _____ ( work) at this school since 1998.
The Smiths have been working/have worked at this school since 1998.
史密斯夫妇从1998年开始在这个学校工作.
用have been working表示现在还在这个学校工作
用have worked表示现在不在这个学校工作了.

has worked
史密斯从1998年就在学校工作。

has worked

have worked 或 have be working
The Smiths The 加姓的复数，史密斯一家或史密斯夫妇，是复数，没错。

have worked