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There’s no way of knowing why one man ma...

There’s no way of knowing why one man makes an important discovery ________ another man, also intelligent, fails.

A.since B.if C.as D.while

 

D 【解析】 考查并列连词。句意:为什么一个人会做出一个重要的发现,而另一个人,也很聪明,但是失败了。A. since自从;B. if如果;C. as因为;D. while然而。前后两句话为两种情况的对比,连词while表示对比。故选D。 【知识拓展】 while的用法 while的意思有很多种,比如,当时,同时等,但是对于上下文的不同其表达的意思不同,下面就来讲解关于while连词的六种用法: 1.引导时间状语从句 译作“当……时”。例如:Make hay while the sun shines.趁着有太阳晒晒草。(乘机行事,抓紧时机。) 2.引导让步状语从句 常放在句首,译作“尽管”、“虽然”,比although或 though语气要轻。例如: While I believe it is true, I cannot prove it.虽然我相信那是真的,但我无法证明。 3.引导条件状语从句 相当于as long as,译作“只要”。例如: While there is life, there is hope.有生命,就有希望。 4.引导原因状语从句 相当于since, 有“既然”的意思。例如:You'll never save any money while you're so extravagant. 你这么奢侈,永远存不下钱来。 5.连接并列句 表示对比,相当于whereas,译作“而”、“可是”。例如:Motion is absolute while stagnation is relative. 运动是绝对的,而静止是相对的。 6.连接并列句 表示递进,相当于and what is more, 译作“并且”、“而且”。例如: Of course, I resolutely determined not to marry, while I quite forgot to consider at all that great rock of disaster in the working-class world-- sickness.当然, 我下定决心不结婚,而且把工人阶级的巨大灾难——疾病,也忘得一干二净。  
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