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

試題分析：句意：科學(xué)家對許多人已經(jīng)感染的病毒做出了詳盡的研究。這里使用了定語從句，先行詞是the virus，定語從句中使用了詞組be infected with，所以缺少介詞with和關(guān)系代詞which，選C。
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