问题
选择题
Living in the central Australian desert has its problems,______ obtaining water is not the least.
A．for which
B．to which
C．of which
D．in which
答案
答案：C
考查定语从句中介词与关系代词的用法。先行词为problems,此句意思为“在这些问题中获得水是最重要的”。在---中，因此选C