【题目】 Scientists believe that it might be several years ______ the medicine can be used on human beings.
A. since B. when C. before D. until
在线课程【答案】C
【解析】
试题分析：考查连词用法。这里是连词before引导的时间状语从句。表示在…之前。该句意思为：科学家相信在那个药可以用在人身上可能还需要几年。
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Scientists believe that it might be several years the medicine can be used on human beings.A. since
编辑：chaxungu时间：2026-04-27 02:54:24分类：高中英语题库
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