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The scientists have made an exhaustive study of the virus _______ many people have been inflected.
A.to whichB.in whichC.with whichD.for which
C

试题分析:句意:科学家对许多人已经感染的病毒做出了详尽的研究。这里使用了定语从句,先行词是the virus,定语从句中使用了词组be infected with,所以缺少介词with和关系代词which,选C。
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