题目内容
The doctor said jokingly that his own infection of the virus _______ the discovery of a vaccine (????)of the disease.
A. stood for B. called for C. paid for D. contributed to
【答案】
D
【解析】
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题目内容
The doctor said jokingly that his own infection of the virus _______ the discovery of a vaccine (????)of the disease.
A. stood for B. called for C. paid for D. contributed to
D
【解析】