There’s no way of knowing why one man makes an important discovery __ _ another man, also intelligent, fails.

A. since B. if C. as D. while

 

D

【解析】

試題分析：句意：沒有辦法知道為什么一個(gè)人做出一項(xiàng)重大發(fā)現(xiàn)，而另外也很聰明的一個(gè)人卻失敗了。這里用D. while 表示對(duì)比“然而”，A. since自從，因?yàn)椋?/span>B. if如果，C. as正如，所以選D。

考點(diǎn)：考查連詞

 

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