—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
考查指示代詞。“有能夠用在人類身上的，抵抗H1N1病毒的疫苗嗎？”“沒有，但是，科學(xué)家正在努力工作來研制一種。這里是泛指一種疫苗，應(yīng)該用one。故選C。”
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