It could take 4-6 months before the first batch（批）of vaccines （疫苗）are available to fight A
It could take 4-6 months before the first batch（批）of vaccines （疫苗）are available to fight A
发布时间：2020-08-16 11:08:45
It could take 4-6 months before the first batch（批）of vaccines （疫苗）are available to fight A/H1N1 flu as swine flu, WHO officials said. A. known B. to know C. knowing D. having known
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(答案→)A. known B. to know C. knowing D. having known 解析：可联系答.案.网客服索取。