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 题目和参考答案——青夏教育精英家教网—

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29. (2013 •新课标 I) 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

29. D

29. D解析：本题考查从属连词和并列连词的区别。句意:不清楚为什么一个人会有重大发现，而另外一个同样聪明的人却失败了。while表示转折和对比，正好符合句式结构和语意逻辑。故选 D.

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