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【题目】The doctor said jokingly that his own infection of the virus _____ the discovery of a vaccine (疫苗)of the disease.

A. stood for B. called for

C. paid for D. contributed to

【答案】D

【解析】短语辨析。A.代表 B. 呼吁 C. ……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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