◎ 题干
About ____ gene-targeting drugs are already in testing pipeline. It won’t be long ____ they are put into effect.
A.two dozen; beforeB.two dozens; thatC.two dozens of; beforeD.dozens; that
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“About ____ gene-targeting drugs are already in testing pipeline. It won’t be long ____ they are put into effect.A.two dozen; beforeB.two dozens; thatC.two d…”主要考查了你对  【序数词】【小数】【分数】【量词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。