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题目
题型:不详难度:来源:
There’s no way of knowing why one man makes an important discovery         another man, also intelligent, fails.
A.sinceB.ifC.asD.while

答案
D
解析

试题分析:句意:没有办法知道为什么一个人取得重大发现,而另一个人,也很聪明,却不能。since 自从if   如果as 像…… 一样 while 而,却,引导并列句,符合题意,选D。
核心考点
试题【There’s no way of knowing why one man makes an important discovery         anoth】;主要考察你对连词等知识点的理解。[详细]
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