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.

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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.
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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 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 time since I last saw a film.
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!

It's a long time since I last saw a film。 对

都对
前者符合语法,后者更符合习惯。

选since是“自.以来”,明确地表示了起始于过去的一个时间点到现在为止的一如果没有since, has been a long time 就没了植根的土壤了。 请及时采纳,