A survey was carried out on the death rate of those who were infected by the pol

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问题 A survey was carried out on the death rate of those who were infected by the pollution, ______ were surprising.

选项 A、as results
B、which results
C、the results of it
D、the results of which

答案 D

解析句意：一项研究被发表了，这项研究针对因污染而被感染的人的死亡率进行了调查，其结果出人意料。最后一个短句是一个非限制性定语从句，说的是研究的结果，而其中的which指代的是研究，因此要用表示所属关系的the+名词+of which结构。

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Asurveywascarriedoutonthedeathrateofthosewhowereinfectedbythepol