A. | since | B. | when | C. | before | D. | until |
分析 科学家们相信也许几年后这种药才可以用在人的身上.
解答 答案:C 句型搭配.it is+时间段+before从句,表示多久以后…才…;since自从,when当…时候,until直到.句意表达的是这种药几年后才能用在人的身上.故选C.
点评 从属连词是连词的一种,用来引导名词性从句和状语从句.大致可分为三大类:that(无词义,不做成分)if,whether (表达是否的意义,但不做句子成分); 连接代词:who,whom,whose,what,which,whatever,whoever,whichever(有词义,在句子中可作主语、表语、宾语);连接副词:when,where,why,how,how many,how long,how far,however,whenever,wherever (有词义,作从句的状语).学习时,要注意区分和掌握.
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