There’s no way of knowing why one man makes an important discovery ________ another man, also intelligent, fails.
A．sinceB．ifC．a(chǎn)sD．while
D
句意：沒辦法知道為什么一個人有重大發(fā)現(xiàn)，而另外一個人雖然也很聰明，卻沒有（重大發(fā)現(xiàn)）。此處while是并列連詞，表示轉(zhuǎn)折和對比，意思是“然而”。根據(jù)句意選D。
【考點定位】本題考查并列連詞的用法。
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