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20.We have no idea why one man makes an important discovery         another man,also intelligent(聪明的),fails.(  )
A.sinceB.ifC.asD.while

分析 我们不知道,为什么一个人做出了重大发现,而另一个人,也很聪明,却失败了.

解答 答案:D;
根据语境以及上下文,本题考查的是连词的用法.根据语境可以推测句意是"我们不知道,为什么一个人做出了重大发现,而另一个人,也很聪明,却失败了."所以该空应填while,while在此处表示"然而"之意,故选D

点评 本题主要考查连词的用法,连词在句子中主要起联系上下文的作用,他们之间的区别就是表示逻辑关系的不同,所以在解题时先要理解上下文含义,然后根据上下文逻辑关系选择合适的连词.连词的用法都比较多,语义之间还有交叉,熟记其基本应用规则,了解其区别,注意固定搭配对象,是做好此类题型的关键.

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