Scientists say it may be a few months____vaccination(疫苗接种) for the epidemic of COVID-19 is widespread throughout the co

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1. (2020高三上·哈尔滨期中) Scientists say it may be a few months____vaccination(疫苗接种) for the epidemic of COVID-19 is widespread throughout the country.

A . until B . after C . before D . since

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备考2022年高考英语一轮复习04：连词