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    精英家教网 > 高中英语 > 题目详情
    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
    C
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    科目：高中英语 来源：河南省期末题 题型：单选题

    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

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