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It's been a long time since I last saw a film.还是It's a long

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It's been a long time since I last saw a film.还是It's a long time since I last saw a film.
It's been a long time since I last saw a film.还是It's a long
都可以.主句用一般现在时和现在完成时都行.
例如:It is/has been three years since I joined the amry.
很高兴为你解答!
多谢你的问题!
再问: It's been a long time since I last saw a film,还是It has been a long time since I last saw a film对?
再答: it's been=it has been it's=it is