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

题干

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

上一题下一题 0.85难度单项选择更新时间:2010-06-06 09:30:57

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