[题目]But at last the determination and patience of the scientists paid off in 1996 with a b-the cloning of Dolly the sheep. 题目和参考答案——青夏教育精英家教网——

题目内容

【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.

【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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