There is no way of knowing why one man makes an important discovery ______ another man, also intelligent, fails.
A．sinceB．ifC．a(chǎn)sD．while
D               

試題分析：考查連詞辨析。A. since因為；B. if 如果；C. as因為；D. while 然而。句意：無法知道為什么一個人有了一個重要發(fā)現(xiàn)，而另一個人，同樣聰明，卻失敗了，”“while”是“而，卻，但是”的意思，表示轉(zhuǎn)折故選D項。
考點 : 考查連詞辨析
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