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About ____ gene-targeting drugs are alre...

About ____ gene-targeting drugs are already in testing pipeline. It won’t be long ____ they are put into effect.

A.two dozen; before  B.two dozens; that    C.two dozens of; before D.dozens; that

 

A 【解析】 试题分析:句意:大约有12个基因有关的药物已经在测试中。在他们付诸实施之前不会很长时间的。dozen前有具体数字时,不加s,不加of,表虚数可指时加“s”,加“of”。第二空根据句意判断。故选A 考点:dozen一词
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