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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．

How

B．

Because

C．

D．

While

分析雖然研究癌癥的整個過程已經耗時一年多，但是技術發展如此之快以至于很快就用不了幾周的時間就有進展了．

解答答案：D
句意表達的是轉折；How 怎樣，引導方式狀語從句；Because因為，引導原因狀語從句；If如果，引導條件狀語從句；While 當…時候，盡管，引導讓步狀語從句．根據句意，故選D．

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，要注意區分和掌握．

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