the airport has been in_____(服务）since 1998

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• 我知道been 是be的过去分词 可是一般来说现在完成时是 have/has+动词过去分词（I have lived here since 1998）这个lived我会用,可我在写作文的时候 从来都不知道现在完成时什么时候需要用到been
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• 我知道been 是be的过去分词 可是一般来说现在完成时是 have/has+动词过去分词（I have lived here since 1998）这个lived我会用,可我在写作文的时候 从来都不知道现在完成时什么时候需要用到been （除了老师教的最基本得,说什么has been 是去了已经回来了）
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