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

1. 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

【考点】

引导时间状语从句的连词;

【答案】

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