Scientists say it may be ten years _____ this medicine was p

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Scientists say it may be ten years _____ this medicine was put to use.
A since B before C after D.when
给出正确答案,理由和翻译

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 英语翻译Scientists say it may be five or ten years ______ it is 非诚勿扰Scientists say it may be five or six years ______ it is Scientists say it may be five or six years ____ it is possib scientists say it may be five or six years before it is poss 英语翻译scientists predict that it may be at most ten years ____ It won`t be( )scientists can find out medicine to cure this Scientists say it may be a fe years___it is possible to test Scientists say it may be a few years___it is possible to tes scientists say it may be five or six years____it is possible It was in the school ________ he studied ten years ago _____ It was ten years ago _____ he worked in the company. [