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做出一項重大發(fā)現(xiàn)，而另外也很聰明的一個人卻失敗了。這里用D. while 表示對比“然而”，A. since自從，因?yàn)�，B. if如果，C. as正如，所以選D。
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