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  3. There are two major problems linked with nuclear power plants, ________ the first concerns nuclear waste.

There are two major problems linked with nuclear power plants, ________ the first concerns nuclear waste.

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问题 There are two major problems linked with nuclear power plants, ________ the first concerns nuclear waste.
选项 A、of which
B、of the two
C、of them
D、of the plants
答案A
解析 分析句子结构可知，逗号后面是一个非限制性定语从句。结合选项可知，只有of which符合题意，关系代词which指代主句中的two major problems。of which the first相当于the first of which。B、C、D三项均不能引导从句。故选A。
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