【题目】But at last the determination and patience of the scientists paid off in 1996 with a b（突破）-the cloning of Dolly the sheep.
在线课程【答案】breakthrough
【解析】前面有冠词，所以判断用名词形式。所以填breakthrough.
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But at last the determination and patience of the scientists paid off in 1996 with a b-the cloning o
编辑：chaxungu时间：2026-04-27 03:02:11分类：高中英语题库
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