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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
    C
    考查指示代词。“有能够用在人类身上的，抵抗H1N1病毒的疫苗吗？”“没有，但是，科学家正在努力工作来研制一种。这里是泛指一种疫苗，应该用one。故选C。”
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