Itcouldtake46monthsbeforethefi

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更新 2022-09-03
科目英语
题型单选题
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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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