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—Have you ever worked as _______________...

—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

 

C 【解析】 考查冠词。句意:——新冠疫情期间,你曾做过志愿者吗?——是的,这对我来说是一次难忘的经历。分析句子可知,第一个空之后的volunteer为可数名词,句中表泛指,应用不定冠词a作为限定词;第二个空后的名词experience,意为“经历”含义,为可数名词,句中表泛指,且其之前形容词unforgettable是以元音音素/ʌ/开头的单词,应用不定冠词an作为限定词。故选C项。  
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