—Have you ever worked as______ volunteer during the COVID-19 pandemic(新冠疫情) 一Yes. It was_______ unforgettable experien

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1. (2022·牡丹模拟) —Have you ever worked as______ volunteer during the COVID-19 pandemic(新冠疫情)
一Yes. It was_______ unforgettable experience for me.

A . an; an B . a; an C . a;a.

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