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    The doctor said jokingly that his own infection of the virus _______ the discovery of a vaccine (疫苗)of the disease.
    A．stood forB．called forC．paid forD．contributed to
    D
    短语辨析。A.代表  B. 呼吁  C. 为……付出代价  D.导致。句意：医生开玩笑的说，他自己被病毒的感染导致发现了这种病毒的疫苗。故选D。
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