【題目】 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】

試題分析:考查連詞用法。這里是連詞before引導(dǎo)的時(shí)間狀語從句。表示在之前。該句意思為:科學(xué)家相信在那個(gè)藥可以用在人身上可能還需要幾年。

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