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    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 【查看更多】

     

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


    1. A.
      is doing
    2. B.
      has done
    3. C.
      had been doing
    4. D.
      did

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

     has done       B. did       C. was doing     D. had been doing did

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    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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