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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

試題分析：句意：沒有辦法知道為什么一個人取得重大發(fā)現(xiàn)，而另一個人，也很聰明，卻不能。since 自從if   如果as 像…… 一樣 while 而，卻，引導(dǎo)并列句，符合題意，選D。
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