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【题目】________ (fight) the virus, China has devoted great efforts to vaccine research and development(疫苗研发).

【答案】To fight

【解析】

句意:为了抗击这种病毒,中国致力于疫苗的研发。

根据“China has devoted great efforts to vaccine research and development.”可知中国致力于疫苗的研发,应该是为了抗击病毒,需用动词不定式表示目的,所以填to fight,因在句首,首字母要大写。故填To fight

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