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The Chinese government research into vaccine against H1N1for months, recently ma

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The Chinese government research into vaccine against H1N1for months, recently ma

The Chinese government ________ research into vaccine against H1N1for months, recently many have received the first doses．

A.is doing

B.has done

C.had been doing

D.did

试题答案

C

标签：monthsh1n1foragainsthavemany

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