问题补充:
Living in the mountain area has its problems , obtaining water is a big problem.
A. of which
B. for what
C. as
D. whose
答案:
(答案→)A. of which
B. for what
C. as
D. whose
解析:句意:生活在山区有它的问题,其中取水是个很大的问题。这里是非限制性定语从句,先行词是problems,表示在众多问题当中的一个,,表示整体和部分的关系,用介词of,所以用A