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    -Is there any vaccine against H1N1 flu that can be used on humans? -No, but scientists are working to develop . A. that B. it C. one D. so 【查看更多】

     

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    ---Is there any vaccine(疫苗) against H1N1 flu that can be used on humans?
    ---No, but scientists are working to develop ______.


    1. A.
      that
    2. B.
      it
    3. C.
      one
    4. D.
      so

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    —Is there any vaccine(疫苗) against H1N1 flu that can be used on humans?

    —No, but scientists are working to develop ________ .

    A. that       B. it        C. one      D. so

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    —Is there any vaccine(疫苗) against H1N1 flu that can be used on humans?
    —No, but scientists are working to develop ________ .

    A．thatB．itC．oneD．so

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