A. | since | B. | when | C. | before | D. | until |
分析 科學家們相信也許幾年后這種藥才可以用在人的身上.
解答 答案:C 句型搭配.it is+時間段+before從句,表示多久以后…才…;since自從,when當…時候,until直到.句意表達的是這種藥幾年后才能用在人的身上.故選C.
點評 從屬連詞是連詞的一種,用來引導名詞性從句和狀語從句.大致可分為三大類:that(無詞義,不做成分)if,whether (表達是否的意義,但不做句子成分); 連接代詞:who,whom,whose,what,which,whatever,whoever,whichever(有詞義,在句子中可作主語、表語、賓語);連接副詞:when,where,why,how,how many,how long,how far,however,whenever,wherever (有詞義,作從句的狀語).學習時,要注意區(qū)分和掌握.
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