— Have you ever worked as___volunteer during the COVID-19 pandemic(新冠疫情)—Yes. It was ___unforgettable experience for me.A.an; anB.an; aC.a; anD.a; a 免费查看参考答案及解析 题目: — I have applied to be a volunteer for the 2022 Asian Games. —___! It will be a me...