Living in the central Australian desert has its problems, ______obtaining water

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问题 Living in the central Australian desert has its problems, ______obtaining water is not the least.

选项 A、for which
B、to which
C、of which
D、in which

答案 C

解析 根据题意,所填词应是引导非限制性定语从句的带有介词的关系代词,由句中least作代词暗示对介词of的选择,故答案为[C]。
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