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Which one is correct?

It's been a long time since we met.
It's been a long time since we've met.

It's been a long time since I went to the gym.
It's been a long time since I've been to the gym.
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I don't find any of them objectionable, but in the general case, the first of each pair is probably the safer choice.

CJ
Comments  

The second is correct...


It's been a long time since we've met