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Scientists say it may be a few years ___...

Scientists say it may be a few years ______ it is possible to test the new medicine on

patients.

A. because           B. after

C. since           D. before

 

D 【解析】 试题分析:考查固定句型的应用。句意:科学家说,在能够对人类进行药物试验之前,可能要经过5或6年.it may be+一段时间+ before 表示在···之前要经过多长时间。 考点:固定句型  
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