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写出所缺词汇

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The scientist spent most of his free time__________( 研究 )new medicine.
写出所缺词汇
解题思路: 如下
解题过程:
The scientist spent most of his free time_______studying___( 研究 )new medicine
解析:“研究”译为study ,spend some time doing sth .“花费多长时间做某事”。
最终答案:略