Through painstaking effort, they at last worked out a way to________ that substance.(pure)
【正确答案】:purify
【题目解析】:原句的意思是“通过艰苦的努力他们最后找到了净化该物质的方法。”因此这里需要填的是个动词,我们填purify。
Through painstaking effort, they at last worked out a way to____
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