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【题目】Scientists around the world are working to________ (发现)new medicine for cancer.

【答案】discover

【解析】

句意:全世界的科学家都在努力寻找治疗癌症的新药。

根据提示词“发现”,英文表达是discover,动词,前面有不定式符号to,所以这里用动词原形,故答案为discover。

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