Past perfect: what had happened before?

When I joined the call, the meeting ___. I missed the first ten minutes.

already startedhas already startedhad already started

I couldn't call you. I ___ my phone at home.

had lefthave leftwas leaving

By the time the taxi arrived, we ___ everything.

packhave packedhad packed

___ you met him before the conference last year?

HadDidHave

Yesterday I ___ to the dentist's.

had wentwenthad gone

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