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【题目】Is there any further ________ in the study on Mars? (develop)

【答案】development

【解析】

句意:对火星的研究还有什么进展吗?

develop动词,发展。根据句意和分析句子可知,此处缺少名词作主语,所以这里用动词develop的名词形式development;结合句中谓语动词is是单数形式,根据就近原则,所以主语development也用单数形式,故填development

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