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
考查并列連詞。根據(jù)句意，前后兩句話為兩種情況的對比“為什么一個人會做出一個重要的發(fā)現(xiàn)，而另一個人，也很聰明，但是失敗了�！辈⒘羞B詞while表示對比。故選D。
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