【題目】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】短語辨析。A.代表 B. 呼吁 C. 為……付出代價 D.導致。句意：醫(yī)生開玩笑的說，他自己被病毒的感染導致發(fā)現(xiàn)了這種病毒的疫苗。故選D。

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