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It could take 4-6 months before the first batch(批)of vaccines are available to f

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It could take 4-6 months before the first batch(批)of vaccines are available to f

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

试题答案

A

标签：vaccinesofbatchtoavailable

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