It could take 4-6 months before the first batch(批)of vaccines (疫苗)are available to fight A/H1N1 flu

题目简介

It could take 4-6 months before the first batch(批)of vaccines (疫苗)are available to fight A/H1N1 flu

题目详情


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.knownB.to knowC.knowingD.having known
题型:单选题难度:偏易来源:不详

答案

A

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