7.___the whole process for the studies of cancer took more than a year,the technology is moving so fast that it will soon take just weeks.( 。
A.HowB.BecauseC.IfD.While

分析 雖然研究癌癥的整個過程已經(jīng)耗時一年多,但是技術(shù)發(fā)展如此之快以至于很快就用不了幾周的時間就有進(jìn)展了.

解答 答案:D
句意表達(dá)的是轉(zhuǎn)折;How 怎樣,引導(dǎo)方式狀語從句;Because因為,引導(dǎo)原因狀語從句;If如果,引導(dǎo)條件狀語從句;While 當(dāng)…時候,盡管,引導(dǎo)讓步狀語從句.根據(jù)句意,故選D.

點(diǎn)評 從屬連詞是連詞的一種,用來引導(dǎo)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(dá)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(xué)習(xí)時,要注意區(qū)分和掌握.

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