问题补充:
单选题Itcouldtake4-6monthsbeforethefirstbatch(批)ofvaccines(疫苗)areavailabletofightA/H1N1flu________asswineflu,WHOofficialssaid.A.knownB.to knowC.knowingD.having known
答案:
A
时间:2021-08-08 22:59:59
单选题Itcouldtake4-6monthsbeforethefirstbatch(批)ofvaccines(疫苗)areavailabletofightA/H1N1flu________asswineflu,WHOofficialssaid.A.knownB.to knowC.knowingD.having known
A
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