— Have you ever worked as________ volunteer during the COVID—19 pandemic(新冠疫情)? —Yes. It was _______unforgettable expe

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1. (2020·贵州) — Have you ever worked as________ volunteer during the COVID—19 pandemic(新冠疫情)?
—Yes. It was _______unforgettable experience for me.

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

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