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【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

【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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