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

【答案】To fight

【解析】

句意:為了抗擊這種病毒,中國致力于疫苗的研發(fā)。

根據(jù)“China has devoted great efforts to vaccine research and development.”可知中國致力于疫苗的研發(fā),應(yīng)該是為了抗擊病毒,需用動(dòng)詞不定式表示目的,所以填to fight,因在句首,首字母要大寫。故填To fight。

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