【題目】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

【答案】D
【解析】根據(jù)句意，前后兩句話為兩種情況的對(duì)比：為什么一個(gè)人會(huì)做出一個(gè)重要的發(fā)現(xiàn)而另一個(gè)人，也很聰明，但是失敗了。并列連詞while表示對(duì)比。故選D。

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