I haven't met him since 1999.=It's ( ) years since I ( ) him.

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I haven't met him since 1999.=It's ( ) years since I ( ) him.
I haven't met him since 1999.=It's ( ) years since I ( ) him.

I haven't met him since 1999.=It's ( ) years since I ( ) him.
It's 11 years since I met him