选B.
后面的宾语是一个从句,before引导的时间状语从句,before this medicine was put to use 这种药物投入使用之前.
Scientists say it may be ten years when this medicine was put to use.
整句话意思是
科学家说10年后这种药物才能投入使用.
Scientists say it may be ten years _____ this medicine was p
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